Estimates of Jewish participation in partisan units throughout Europe range from 20,000 to 100,000.[323] In the occupied Polish and Soviet territories, thousands of Jews fled into the swamps or forests and joined the partisans,[324] although the partisan movements did not always welcome them.[325] An estimated 20,000 to 30,000 joined the Soviet partisan movement.[326] One of the famous Jewish groups was the Bielski partisans in Belarus, led by the Bielski brothers.[324] Jews also joined Polish forces, including the Home Army. According to Timothy Snyder, "more Jews fought in the Warsaw Uprising of August 1944 than in the Warsaw Ghetto Uprising of April 1943".[327][r]
As discrimination against Jews increased, German law required a legal definition of a Jew and an Aryan. Promulgated at the annual Nazi Party rally in Nürnberg on September 15, 1935, the Nürnberg Laws—the Law for the Protection of German Blood and German Honour and the Law of the Reich Citizen—became the centrepiece of anti-Jewish legislation and a precedent for defining and categorizing Jews in all German-controlled lands. Marriage and sexual relations between Jews and citizens of “German or kindred blood” were prohibited. Only “racial” Germans were entitled to civil and political rights. Jews were reduced to subjects of the state. The Nürnberg Laws formally divided Germans and Jews, yet neither the word German nor the word Jew was defined. That task was left to the bureaucracy. Two basic categories were established in November: Jews, those with at least three Jewish grandparents; and Mischlinge (“mongrels,” or “mixed breeds”), people with one or two Jewish grandparents. Thus, the definition of a Jew was primarily based not on the identity an individual affirmed or the religion he or she practiced but on his or her ancestry. Categorization was the first stage of destruction.
The Roma refer to the genocide of the Romani people as the Pořajmos.[414] Because they are traditionally a private people with a culture based on oral history, less is known about their experience than that of any other group.[415] Bauer writes that this can be attributed to the Roma's distrust and suspicion, and to their humiliation because some of the taboos in Romani culture regarding hygiene and sex were violated at Auschwitz.[416] In May 1942, the Roma were placed under similar laws to the Jews. On 16 December 1942, Himmler issued a decree that "Gypsy Mischlinge [mixed breeds], Roma Gypsies, and members of the clans of Balkan origins who are not of German blood" should be sent to Auschwitz, unless they had served in the Wehrmacht.[417] He adjusted the order on 15 November 1943; in the occupied Soviet areas, "sedentary Gypsies and part-Gypsies are to be treated as citizens of the country. Nomadic Gypsies and part-Gypsies are to be placed on the same level as Jews and placed in concentration camps."[418] Bauer argues that this adjustment reflected Nazi ideology that the Roma, originally an Aryan population, had been "spoiled" by non-Romani blood.[419]

As the tide of World War II turned against the Nazis, they began a systematic plan to eliminate or "liquidate" the ghettos they had established, by a combination of mass murder on the spot and transferring the remaining residents to extermination camps. When the Nazis attempted to liquidate the Warsaw Ghetto on April 13, 1943, the remaining Jews fought back in what has become known as the Warsaw Ghetto Uprising. The Jewish resistance fighters held out against the entire Nazi regime for 28 days, longer than many European countries had been able to withstand Nazi conquest.
One of the Auschwitz survivors who was selected by Dr. Josef Mengele for his cruel and horrific experiments was Yitzchak Ganon, a Greek Jew who was deported, along with his parents and 5 brothers and sisters to Auschwitz in 1944, according to a news article by Alan Hall, published on December 11, 2009. Ganon told reporter Alan Hall that he was selected for an experiment in which Dr. Mengele removed one of his kidneys without an anesthetic: "He cut into me without an anesthetic. The pain was indescribable. I felt every slice of the knife. Then I saw my kidney pulsating in his hand. [...] After the operation I was given no painkillers and put to work. I cleaned up after the bloody operations carried out by Mengele."

The entry of the U.S. into the War is also crucial to the time-frame proposed by Christian Gerlach, who argued in his 1997 thesis,[122] that the Final Solution decision was announced on 12 December 1941, when Hitler addressed a meeting of the Nazi Party (the Reichsleiter) and of regional party leaders (the Gauleiter).[123][a] The day after Hitler's speech, on 13 December 1941 Joseph Goebbels wrote in his diary:[125]

But there is a note that drills deeper than commemoration: it goes to the idea of identification. To “identify with” is to become what one is not, to become what one is not is to usurp, to usurp is to own—and who, after all, in the half century since Miep Gies retrieved the scattered pages of the diary, really owns Anne Frank? Who can speak for her? Her father, who, after reading the diary and confessing that he “did not know” her, went on to tell us what he thought she meant? Meyer Levin, who claimed to be her authentic voice—so much so that he dared to equate the dismissal of his work, however ignobly motivated, with Holocaust annihilation? Hellman, Bloomgarden, Kanin, whose interpretations clung to a collective ideology of human interchangeability? (In discounting the significance of the Jewish element, Kanin had asserted that “people have suffered because of being English, French, German, Italian, Ethiopian, Mohammedan, Negro, and so on”—as if this were not all the more reason to comprehend and particularize each history.) And what of Cara Wilson and “the children of the world,” who have reduced the persecution of a people to the trials of adolescence?
Its historical significance makes the term Final Solution the most important example of the ability of Nazi language to integrate potentially different if not divergent approaches towards the so-called Jewish question into a conceptual frame of reference that helped facilitate systematic mass murder and to hide the Third Reich's genocidal policies behind technocratic abstractions, thus providing legitimization for perpetrators and enabling bystanders to claim not to know what was going on. Despite its inherent problems, most notably in evoking the illusion of coordinated planning and systematic implementation, the term Final Solution remains crucial for recognizing the process character of the Holocaust as a key element in a broader history of state-sponsored mass murder during the Nazi era.
Not long after beginning the survey of the site, Freund and his team confirmed the existence of a previously unmarked burial pit. At 80 feet across and 15 feet deep, the scientists calculated that the grave contained the cremated remains of as many as 7,000 people. The researchers also released the preliminary results of their search for the tunnel, along with a series of ERT-generated cross sections that revealed the tunnel’s depth beneath the ground’s surface (15 feet at points) and its dimensions: three feet by three feet at the very widest, not much larger than a human torso. From the entrance inside the bunker to the spot in the forest, now long grown over, where the prisoners emerged measured more than 110 feet. At last, there was definitive proof of a story known until now only in obscure testimonies made by a handful of survivors—a kind of scientific witness that transformed “history into reality,” in the words of Miri Regev, Israel’s minister of culture, who highlighted the importance of documenting physical evidence of Nazi atrocities as a bulwark against “the lies of the Holocaust deniers.”
The photo above was taken while Mengele was home on leave, after spending 5 months at Auschwitz-Birkenau. He is wearing an Iron Cross medal on the pocket of his uniform. Mengele was very proud of his medals; he earned the Iron Cross 2nd Class shortly after he was sent to the Ukraine in June 1941 at the time of the German invasion of the Soviet Union. In January 1942, Mengele joined the prestigious 5th SS Panzer Division, nicknamed the Viking Division. In July 1942, he was awarded the Iron Cross 1st Class after he pulled two wounded soldiers out of a burning tank under enemy fire on the battlefield, and administered medical first aid to them.
Browning believes that the "Final Solution as it is now understood—the systematic attempt to murder every last Jew within the German grasp"[5] took shape during a five-week period, from 18 September to 25 October 1941. During this time: the sites of the first extermination camps were selected, different methods of killing were tested, Jewish emigration from the Third Reich was forbidden, and 11 transports departed for Łódź as a temporary holding station. During this period, Browning writes, "The vision of the Final Solution had crystallised in the minds of the Nazi leadership, and was being turned into reality."[5] This period was the peak of Nazi victories against the Soviet Army on the Eastern Front, and, according to Browning, the stunning series of German victories led to both an expectation that the war would soon be won, and the planning of the final destruction of the "Jewish-Bolshevik enemy".[114]
There were setbacks. In March, the diggers discovered they were tunneling in the direction of a burial pit and were forced to reroute the passageway, losing days in the process. Not long afterward, Dogim was on burial pit duty when he unearthed the bodies of his wife, mother and two sisters. Every member of the Burning Brigade lived with the knowledge that some of the corpses he was helping to burn belonged to family members. And yet to see one’s wife lying in the pit was something else entirely, and Dogim was consumed with sadness and fury. “[He] said he had a knife, that he was going to stab and kill the Sturmbannführer,” Farber later recalled. Farber told Dogim that he was thinking selfishly—even if he succeeded, the rest of the prisoners would be killed in retribution.
While the Righteous Among the Nations went to different lengths to save Jews, Yad Vashem outlines four distinct ways these individuals helped the Jewish community. The first was by hiding Jews in the rescuer's home or on their property and providing food and other necessities to the Jews while in hiding. Secondly, some of the Righteous obtained false papers and false identities for those they saved. The third type of rescuer specified by Yad Vashem were those who helped Jews escape from Nazi occupied territory or to a less dangerous area. Finally, some rescuers saved children after their parents had been taken to concentration camps or killed.
At the end of the war, between 50,000 and 100,000 Jewish survivors were living in three zones of occupation: American, British and Soviet. Within a year, that figure grew to about 200,000. The American zone of occupation contained more than 90 percent of the Jewish displaced persons (DPs). The Jewish DPs would not and could not return to their homes, which brought back such horrible memories and still held the threat of danger from anti-Semitic neighbors. Thus, they languished in DP camps until emigration could be arranged to Palestine, and later Israel, the United States, South America and other countries. The last DP camp closed in 1957 (David S. Wyman, "The United States," in David S. Wyman, ed., The World Reacts to the Holocaust, Baltimore, MD: Johns Hopkins University Press, 1996, pp. 707­10).
Holocaust, Hebrew Shoʾah (“Catastrophe”), Yiddish and Hebrew Ḥurban (“Destruction”), the systematic state-sponsored killing of six million Jewish men, women, and children and millions of others by Nazi Germany and its collaborators during World War II. The Germans called this “the final solution to the Jewish question.” Yiddish-speaking Jews and survivors in the years immediately following their liberation called the murder of the Jews the Ḥurban, the word used to describe the destruction of the First Temple in Jerusalem by the Babylonians in 586 bce and the destruction of the Second Temple by the Romans in 70 ce. Shoʾah (“Catastrophe”) is the term preferred by Israelis and the French, most especially after Claude Lanzmann’s masterful 1985 motion picture documentary of that title. It is also preferred by people who speak Hebrew and by those who want to be more particular about the Jewish experience or who are uncomfortable with the religious connotations of the word Holocaust. Less universal and more particular, Shoʾah emphasizes the annihilation of the Jews, not the totality of Nazi victims. More particular terms also were used by Raul Hilberg, who called his pioneering work The Destruction of the European Jews, and Lucy S. Dawidowicz, who entitled her book on the Holocaust The War Against the Jews. In part she showed how Germany fought two wars simultaneously: World War II and the racial war against the Jews. The Allies fought only the World War. The word Holocaust is derived from the Greek holokauston, a translation of the Hebrew word ʿolah, meaning a burnt sacrifice offered whole to God. This word was chosen because in the ultimate manifestation of the Nazi killing program—the extermination camps—the bodies of the victims were consumed whole in crematoria and open fires.
Three defendants were acquitted. However, many of the Nazis who perpetrated the Holocaust were never tried or punished, including Hitler who had committed suicide. Since then, the international community has continued and improved accountability through forums such as the International Criminal Court, and the International Criminal Tribunal for Rwanda.

“Who has made us Jews different from all other people? Who has allowed us to suffer so terribly up until now? It is God who has made us as we are, but it will be God, too, who will raise us up again. Who knows? It might even be our religion from which the world and all peoples learn good, and for that reason and only that reason do we suffer. We can never become just Netherlanders, or just English or representatives of any country for that matter. We will always remain Jews, but we want to, too.” – April 11, 1944
While these massacres were happening, the Nazis elsewhere were laying plans for an overall 'solution to the Jewish question'. Death camp operations began in December 1941 at Semlin in Serbia and Chelmno in Poland, where people were killed by exhaust fumes in specially modified vans, which were then driven to nearby sites where the bodies were plundered and burnt. 250,000 Jews were killed this way at Chelmno and 15,000 at Semlin.
While Clauberg and Schumann were busy with experiments designed to develop methods for the biological destruction of people regarded by the Nazis as undesirable, another medical criminal, SS-Hauptsturmführer Josef Mengele, M.D., Ph.D., was researching the issues of twins and the physiology and pathology of dwarfism in close cooperation with the Kaiser Wilhelm Institute of Anthropology, Genetics, and Eugenics in Berlin-Dahlem. He was also interested in people with different colored irises (heterochromia iridii), and in the etiology and treatment of the gangrenous disease of the face known as noma Faciei (cancrum oris, gangrenous stomatitis), a little understood disease endemic to the Gypsy prisoners in Auschwitz.
The Third Reich first used concentration camps as places of unlawful incarceration of political opponents and other "enemies of the state". Large numbers of Jews were not sent there until after Kristallnacht in November 1938.[182] Although death rates were high, the camps were not designed as killing centers.[183] After war broke out in 1939, new camps were established, some outside Germany in occupied Europe.[184] In January 1945, the SS reports had over 700,000 prisoners in their control, of which close to half had died by the end of May 1945 according to most historians.[185] Most wartime prisoners of the camps were not Germans but belonged to countries under German occupation.[186]
But Soviet forces were hurtling toward Auschwitz, and in November the order went out to conceal all evidences of gassing and to blow up the crematoria. Tens of thousands of inmates, debilitated and already near extinction, were driven out in bitter cold on death marches. Many were shot. In an evacuation that occurred either on October 28th or on November 2nd, Anne and Margot were dispatched to Bergen-Belsen. Margot was the first to succumb. A survivor recalled that she fell dead to the ground from the wooden slab on which she lay, eaten by lice, and that Anne, heartbroken and skeletal, naked under a bit of rag, died a day or two later.

From 1933 onward, anti-Jewish propaganda had flooded Germany. Under the skillful direction of Joseph Goebbels, his Nazi Propaganda Ministry churned out a ceaseless stream of leaflets, posters, newspaper articles, cartoons, newsreels, slides, movies, speeches, records, exhibits and radio pronouncements. As a result, the accusations, denunciations and opinions which Hitler first expressed in his book, Mein Kampf, had become institutionalized, accepted as time-tested beliefs by all Nazis, taught as fact to impressionable youths, and drilled into the minds of eager-to-please SS recruits.

“In any of these circumstances, what you want—the biggest thing you want, the most important—is to be able to make these places visible,” Freund told me later, back in Vilnius. “Your goal is to mark them in a way that people can come to them with tears in their eyes, come to them as memorials, come to them to say the mourner’s kaddish. Because the worst thing would be to look away. To forget.”
The Texas Senator upset that holocaust denier, Arthur Jones has won the Republican nomination for Illinois third Congressional district. — Fox News, "Judge Jeanine: The rise of socialism," 1 July 2018 In 1947, with immigration quotas still in existence, the SS Exodus, a boat carrying holocaust survivors who intended to migrate to Mandatory Palestine, was boarded by British forces, who killed three and returned the rest to refugee camps in Europe. — Billy Perrigo, Time, "Prince William Is Visiting the Middle East. Here's What to Know About Britain's Controversial Role in Shaping the Region," 25 June 2018 As the son of a Polish holocaust survivor, the images and sounds of this family separation policy is heart wrenching,’ Cohen wrote. — Chris Stirewalt, Fox News, "Like Bush and Obama, Trump gets stuck on immigration," 21 June 2018 According to holocaust historian Eric Saul, about 20 scouts of the 522nd Field Artillery entered Dachau’s ‘Camp X’ finding the crematoria and gas chambers. — Johnny Miller, San Francisco Chronicle, "Survivors thank ‘strange’ liberators," 18 Apr. 2018 In the book, the protagonist — a black female — wakes up 250 years after a nuclear holocaust, to find that humans have been rescued by aliens with three genders. — Billy Perrigo, Time, "Octavia E. Butler, Who Brought Diversity to the World of Science Fiction, Honored With Google Doodle," 22 June 2018 As the son of a Polish holocaust survivor, the images and sounds of this family separation policy is heart wrenching. — Monique Judge, The Root, "Is Michael Cohen About to Flip on Trump?," 20 June 2018 So, yeah, one of the North Korean team members led the world to a nuclear holocaust [but] that’s a truly impactful moment for that kid. — Mark Harris, Ars Technica, "First space, then auto—now Elon Musk quietly tinkers with education," 25 June 2018 To be sure, the current U.S. moral crisis is no holocaust and IBM’s deep involvement in customizing its punch card technology for the Nazis stands out like a red flag compared to a simple government cloud services contract. — Aaron Pressman, Fortune, "Data Sheet—Tech Industry Condemns Migrant Child Separation Policy. But What Will They Actually Do About It?," 20 June 2018

So the following year, in June 2016, Freund returned with two groups of researchers and their equipment and for the first time mapped the unknown areas of the site, including any unmarked mass graves. Then, using a collection of aerial photographs of Ponar shot by Nazi reconnaissance planes and captured during the war, which helped give the researchers a better sense of the camp’s layout, Freund and his colleagues turned their attention to finding clues about how the camp’s fabled survivors were able to find a way out. (A “Nova” television documentary about the discoveries found in Vilnius, "Holocaust Escape Tunnel" will premiere on PBS on April 19. Check your local listings for times.)

On September 21, 1939, Reinhard Heydrich ordered the establishment of the Judenräte (“Jewish Councils”), comprising up to 24 men—rabbis and Jewish leaders. Heydrich’s order made these councils personally responsible in “the literal sense of the term” for carrying out German orders. When the Nazis sealed the Warsaw Ghetto, the largest of German-occupied Poland’s 400 ghettos, in the fall of 1940, the Jews—then 30 percent of Warsaw’s population—were forced into 2.4 percent of the city’s area. The ghetto’s population reached a density of more than 200,000 persons per square mile (77,000 per square km) and 9.2 per room. Disease, malnutrition, hunger, and poverty took their toll even before the first bullet was fired.

“With respect of the Jewish Question, the Führer has decided to make a clean sweep. He prophesied to the Jews that if they again brought about a world war, they would live to see their annihilation in it. That wasn’t just a catchword… If the German people have now again sacrificed 160,000 dead on the eastern front, then those responsible for this bloody conflict will have to pay with their lives.”
His grip on German society tightened and those who publicly objected to Nazi policies were often sentenced to hard labour in the rapidly expanding concentration camp system. Jews were subjected to further laws restricting their rights, but rising anti-Semitism in Europe wasn’t limited to Germany. In the UK, Oswald Mosley’s British Union of Fascists gained support from sections of the public and press, even filling the Royal Albert Hall in April.
First published in in we 1994 and based on Gushee's doctoral thesis. This book appears to have been widely received with acclaim. On one level I understand why - the preliminary chapters that set out the sheer scale, both numerically and bureaucratically of the holocaust and the level of Gentile ambivalence to the genocide before its eyes is breathtaking.
The Mossad was still a young agency, short of resources and manpower. Moreover, as Aharoni later put it in testimony for the Mossad’s history department, “When Isser began dealing with something, he dealt only with that.” In addition, the agency had been blindsided, knowing nothing about the German scientists and the missiles they were building for Israel’s biggest enemy. Harel mobilized the entire agency to deal with it.

The rescuers were able to use the national humiliation caused by the German occupation to build limited popular support and help the Jews. They were few in number but ethically and morally strong. Although the number of Jews they saved was small, they provide a beacon of victory for posterity, a victory over the capitulation and collaboration of the majority of their compatriots.
To the Nazi regime, there would have been no doubt that a war against Bolshevism was implicitly a war against the Jewish population of the Soviet Union. A division of Hitler’s SS known as the Einsatzgruppen traveled behind the German army and acted as death squads, exterminating civilian populations in the most efficient way possible. During the early part of Operation Barbarossa these were frequently people who had fled the Nazi’s earlier invasion of Poland.
There are three versions of the diary. The first is the diary as Anne originally wrote it from June 1942 to August 1944. Anne hoped to publish a book based on her entries, especially after a Dutch official announced in 1944 that he planned to collect eyewitness accounts of the German occupation. She then began editing her work, leaving out certain passages. That became the second version. Her father created a third version with his own edits as he sought to get the diary published after the war.
"... Believe me, I'd like to listen, but it doesn't work, because if I'm quiet and serious, everyone thinks I'm putting on a new act and I have to save myself with a joke, and then I'm not even talking about my own family, who assume I must be ill, stuff me with aspirins and sedatives, feel my neck and forehead to see if I have a temperature, ask about my bowel movements and berate me for being in a bad mood, until I just can't keep it up any more, because when everybody starts hovering over me, I get cross, then sad, and finally end up turning my heart inside out, the bad part on the outside and the good part on the inside, and keep trying to find a way to become what I'd like to be and what I could be if ... if only there were no other people in the world."
Though the Nazis tried to keep operation of camps secret, the scale of the killing made this virtually impossible. Eyewitnesses brought reports of Nazi atrocities in Poland to the Allied governments, who were harshly criticized after the war for their failure to respond, or to publicize news of the mass slaughter. This lack of action was likely mostly due to the Allied focus on winning the war at hand, but was also a result of the general incomprehension with which news of the Holocaust was met and the denial and disbelief that such atrocities could be occurring on such a scale.
Relying on a surveying device known as a total station—the tripod-mounted optical instrument employed by construction and road crews—Reeder set about measuring minute elevation changes across the land, searching for subtle gradations and anomalies. He zeroed in on a hummock that looked like the earthen side of a bunker, long since overgrown with moss and foliage, and roughly 100 feet away, a telltale dip in the earth.
As the war continued, the rescuers learned to adapt and work around the Nazi network of informers and collaborators. However, they were never able to develop effective strategies to combat the Nazis’ rapid organization of mass deportations and population transfers. As the war progressed, rescuers were able to identify sympathetic local groups, individuals, and organizations in every country of occupied Europe; for example, low-level clergymen, Socialists, Communists, and nationalist anti-Nazis. At all times, however, the success of Jewish rescue depended upon fate and chance.
Double-sided ramps were built inside the pits. One crew hauled stretchers filled with corpses up the ramp, and another crew pushed the bodies onto the pyre. In a week, the Burning Brigade might dispose of 3,500 bodies or more. Later, the guards forced prisoners to sift through the ashes with strainers, looking for bone fragments, which would then be pounded down into powder.
After its defeat in World War I, Germany was humiliated by the Versailles Treaty, which reduced its prewar territory, drastically reduced its armed forces, demanded the recognition of its guilt for the war, and stipulated it pay reparations to the allied powers. With the German Empire destroyed, a new parliamentary government called the Weimar Republic was formed. The republic suffered from economic instability, which grew worse during the worldwide depression after the New York stock market crash in 1929. Massive inflation followed by very high unemployment heightened existing class and political differences and began to undermine the government.
After 1942, the economic functions of the camps, previously secondary to their penal and terror functions, came to the fore. Forced labor of camp prisoners became commonplace.[182] The guards became much more brutal, and the death rate increased as the guards not only beat and starved prisoners, but killed them more frequently.[186] Vernichtung durch Arbeit ("extermination through labor") was a policy—camp inmates would literally be worked to death, or to physical exhaustion, at which point they would be gassed or shot.[187] The Germans estimated the average prisoner's lifespan in a concentration camp at three months, due to lack of food and clothing, constant epidemics, and frequent punishments for the most minor transgressions.[188] The shifts were long and often involved exposure to dangerous materials.[189]
The fire signaled the demise of German democracy. On the next day, the government, under the pretense of controlling the Communists, abolished individual rights and protections: freedom of the press, assembly, and expression were nullified, as well as the right to privacy. When the elections were held on March 5, the Nazis received nearly 44 percent of the vote, and with 8 percent offered by the Conservatives, won a majority in the government.

In early 1942 the Nazis built killing centres at Treblinka, Sobibor, and Belzec in occupied Poland. The death camps were to be the essential instrument of the “final solution.” The Einsatzgruppen had traveled to kill their victims. With the killing centres, the process was reversed. The victims were taken by train, often in cattle cars, to their killers. The extermination camps became factories producing corpses, effectively and efficiently, at minimal physical and psychological cost to German personnel. Assisted by Ukrainian and Latvian collaborators and prisoners of war, a few Germans could kill tens of thousands of prisoners each month. At Chelmno, the first of the extermination camps, the Nazis used mobile gas vans. Elsewhere they built permanent gas chambers linked to the crematoria where bodies were burned. Carbon monoxide was the gas of choice at most camps. Zyklon-B, an especially lethal killing agent, was employed primarily at Auschwitz and later at Majdanek.

After Germany’s loss in WWI, the Treaty of Versailles punished Germany by placing tough restrictions on the country. The treaty made Germany take full responsibility for the war, reduced the extent of German territory, severely limited the size and placement of their armed forces, and forced Germany to pay the allied powers reparations. These restrictions not only increased social unrest but, combined with the start of the Great Depression, collapsed the German economy as inflation rose alongside unemployment.
After the Wannsee Conference in January 1942, the Nazis began the systematic deportation of Jews from all over Europe to six extermination camps established in former Polish territory -- Chelmno , Belzec, Sobibor, Treblinka, Auschwitz-Birkenau, and Majdanek. Extermination camps were killing centers designed to carry out genocide. About three million Jews were gassed in extermination camps.

Mengele's work also involved carrying out selections, a task that he chose to perform even when he was not assigned to do so, in the hope of finding subjects for his experiments,[33] with a particular interest in locating sets of twins.[34] In contrast to most of the other SS doctors, who viewed selections as one of their most stressful and unpleasant duties, he undertook the task with a flamboyant air, often smiling or whistling a tune.[35][31] He was also one of the SS doctors responsible for supervising the administration of Zyklon B, the cyanide-based pesticide that was used for the mass killings in the Birkenau gas chambers. He served in this capacity at the gas chambers located in crematoria IV and V.[36]