After the September 1939 German invasion of Poland (the beginning of World War II), anti-Jewish policy escalated to the imprisonment and eventual murder of European Jewry. The Nazis first established ghettos (enclosed areas designed to isolate and control the Jews) in the Generalgouvernement (a territory in central and eastern Poland overseen by a German civilian government) and the Warthegau (an area of western Poland annexed to Germany). Polish and western European Jews were deported to these ghettos where they lived in overcrowded and unsanitary conditions with inadequate food.
In the final months of the war, SS guards moved camp inmates by train or on forced marches, often called “death marches,” in an attempt to prevent the Allied liberation of large numbers of prisoners. As Allied forces moved across Europe in a series of offensives against Germany, they began to encounter and liberate concentration camp prisoners, as well as prisoners en route by forced march from one camp to another. The marches continued until May 7, 1945, the day the German armed forces surrendered unconditionally to the Allies.
Hitler targeted the Jews for a specific reason, which was not just racial. The elimination of the Jews had a unique “status” in Hitler’s master plan. While he certainly killed millions of others (gypsies, communists, homosexuals, etc.) he made exceptions for all these groups. The only group for which no exception was made was the Jews—they all had to die.
The political situation in Germany and elsewhere in Europe after World War I (1914–1918) contributed to the rise of virulent antisemitism. Many Germans did not accept that their country had been defeated, which gave birth to the stab-in-the-back myth. This insinuated that it was disloyal politicians, chiefly Jews and communists, who had orchestrated Germany's surrender. Inflaming the anti-Jewish sentiment was the apparent over-representation of Jews in the leadership of communist revolutionary governments in Europe, such as Ernst Toller, head of a short-lived revolutionary government in Bavaria. This perception contributed to the canard of Jewish Bolshevism.[65]
One of the most atrocious eras in human history is without a doubt the Holocaust. About 11 million people, including approximately 6 million Jews, are estimated to have been slaughtered at the hands of Adolf Hitler and the Nazi Party. Jews were forced to live in ghettos and then rounded up to be sent to concentration and extermination camps, where they were herded into gas chambers and killed. At a number of concentration camps, Nazi doctors conducted gruesome and horrific medical experiments on prisoners against their will. This leads us to one of the most infamous Nazi doctors who ever lived, Dr. Josef Mengele.
Racial-Morphological Examinations of the Anterior Portion of the Lower Jaw in Four Racial Groups. This dissertation, completed in 1935 and first published in 1937, earned him a PhD in anthropology from Munich University. In this work Mengele sought to demonstrate that there were structural differences in the lower jaws of individuals from different ethnic groups, and that racial distinctions could be made based on these differences.[7][121]
While Jews began to flee abroad from the first days of the Nazi regime, only after Kristallnacht in November 1938 did Nazi policy switch categorically to the expulsion of all Jews from the Reich as its central aim. Although the Jews were ever-more intensively disemployed, defined as noncitizens, ostracized, stripped of wealth, brutalized, and encouraged to emigrate, they were not being killed by the government, and the majority of Germany’s five hundred thousand Jews managed to escape from the country before the outbreak of the war (though not necessarily to safety, as many wound up trapped in Poland and the Soviet Union). Indeed, so effective were the Nazis at expelling the Jews from their territories that about two-thirds of Austria’s two hundred thousand Jews managed to flee abroad in the short period between the German takeover of Austria in March 1938 and the closing of the borders to further Jewish emigration from the Reich in 1940-1941.
Browning describes the creation of the extermination camps, which were responsible for the largest number of deaths in the Final Solution, as bringing together three separate developments within the Third Reich: the concentration camps which had been established in Germany since 1933; an expansion of the gassing technology of the Nazi euthanasia programme to provide killing mechanism of greater efficiency and psychological detachment; and the creation of "factories of death" to be fed endless streams of victims by mass uprooting and deportation that utilized the experience and personnel from earlier population resettlement programmes—especially the HSSPF and Adolf Eichmann's RSHA for "Jewish affairs and evacuations".[115]
^ Kwiet, Konrad (1998). "Rehearsing for Murder: The Beginning of the Final Solution in Lithuania in June 1941". Holocaust and Genocide Studies. 12 (1): 3–26. doi:10.1093/hgs/12.1.3. and Kwiet, Konrad (4 December 1995). The Onset of the Holocaust: The Massacres of Jews in Lithuania in June 1941. J. B. and Maurice Shapiro Senior Scholar-in-Residence at the United States Holocaust Memorial Museum (Annual lecture). Published under the same title, but expanded in Bonnell, Andrew, ed. (1996). Power, Conscience and Opposition: Essays in German History in Honour of John A Moses. New York: Peter Lang. pp. 107–21.
The Theresienstadt ghetto was established by the Nazis in an 18th century fortress in Czechoslovakia on November 24, 1941. More than 150,000 Jews passed through the ghetto during its four-year existence, which was used as a holding area for eventual murder in Auschwitz. By 1943, rumors began circulating in the international community that the Nazis were exterminating Jews in gas chambers, and that the conditions of the ghettos did not permit survival. The Nazis rebuilt parts of this ghetto to serve as a “showpiece” for propaganda purposes. Flower gardens were planted in the ghetto. Shops, schools, and a cafe were built. When an investigating commission of the International Red Cross came to visit, they did not see a typical ghetto. In July 1944 the Nazis made a documentary propaganda film about life in this ghetto. After the movie was completed, most of the Jewish “actors” were shipped to their death at Auschwitz.
By now, experimental mobile gas vans were being used by the Einsatzgruppen to kill Jews in Russia. Special trucks had been converted by the SS into portable gas chambers. Jews were locked up in the air-tight rear container while exhaust fumes from the truck's engine were fed in to suffocate them. However, this method was found to be somewhat impractical since the average capacity was less than 50 persons. For the time being, the quickest killing method continued to be mass shootings. And as Hitler's troops advanced deep into the Soviet Union, the pace of Einsatz killings accelerated. Over 33,000 Jews in the Ukraine were shot in the Babi Yar ravine near Kiev during two days in September 1941.
The biblical term shoah (Hebrew: שׁוֹאָה), meaning "destruction", became the standard Hebrew term for the murder of the European Jews, first used in a pamphlet in 1940, Sho'at Yehudei Polin ("Sho'ah of Polish Jews"), published by the United Aid Committee for the Jews in Poland.[11] On 3 October 1941 the cover of the magazine The American Hebrew used the phrase "before the Holocaust", apparently to refer to the situation in France,[12] and in May 1943 The New York Times, discussing the Bermuda Conference, referred to the "hundreds of thousands of European Jews still surviving the Nazi Holocaust".[13] In 1968 the Library of Congress created a new category, "Holocaust, Jewish (1939–1945)".[14] The term was popularized in the United States by the NBC mini-series Holocaust (1978), about a fictional family of German Jews,[15] and in November 1978 the President's Commission on the Holocaust was established.[16] As non-Jewish groups began to include themselves as Holocaust victims too, many Jews chose to use the terms Shoah or Churban instead.[12][g] The Nazis used the phrase "Final Solution to the Jewish Question" (German: die Endlösung der Judenfrage).[18]

Although the composition of the ground, largely sand, was favorable for ground-penetrating radar, the dense forest surrounding the site interfered enough with the radar signals that they decided to try another tack. Paul Bauman and Alastair McClymont, geophysicists with Advisian WorleyParsons, a transnational engineering company, had more luck with electrical resistivity tomography, or ERT, which was originally developed to explore water tables and potential mining sites. ERT technology sends jolts of electrical current into the earth by way of metal electrodes hooked up to a powerful battery and measures the distinctive levels of resistivity of different types of earth; the result is a detailed map to a depth of more than a hundred feet.
British troops guard Alex Pickowski, Camp Commandant of Dechau concentration camp  © The discovery of Belsen brought home the shocking truth about Nazi atrocities, but the facts had been known for some time. As early as the summer of 1941, British signals intelligence had intercepted and decoded radio messages from German police units co-operating with the Einsatzgruppen, and details of the killings of Jews were included in the monthly summaries that were sent to Churchill. Churchill responded with a speech on August 24 1941 in which he called the massacres 'a crime without a name' but erroneously identified the victims as 'Russian patriots defending their native soil'. Otherwise, these facts were not made public.

In 1933 Anne’s family—her father, Otto; her mother, Edith; and her older sister, Margot—moved to Amsterdam from Germany following the rise of Adolf Hitler. In 1940 the Netherlands was invaded by Germany, which began to enact various anti-Jewish measures, one of which required Anne and her sister to enroll in an all-Jewish school the following year. On June 12, 1942, Anne received a red-and-white plaid diary for her 13th birthday. That day she began writing in the book: “I hope I will be able to confide everything to you, as I have never been able to confide in anyone, and I hope you will be a great source of comfort and support.” The following month Margot received an order to report to a labour camp. Facing arrest if she did not comply, the family went into hiding on July 6, 1942, moving into a “secret annex” at Otto’s business in Amsterdam, the entrance to which was soon hidden behind a moveable bookcase. The Franks were later joined by four other Jews—Hermann and Auguste van Pels and their son, Peter, and Fritz Pfeffer—and were aided by several friends, including Miep Gies, who brought food and other supplies.

They were dependent on the general political and military situation. Helping Jews was thus more successful as liberation approached than in the early days of the war. Later in the war, the time required in hiding was shorter, support from local resistance movements was better organized, and the degree of popular hostility to rescue was muted by imminent military defeat.
G. Aly, "Final Solution": Nazi Population Policy and the Murder of the European Jews (1999); C.R. Browning (with contributions by J. Matthäus), The Origins of the Final Solution: The Evolution of Nazi Jewish Policy, September 1939- March 1942 (2004); R. Hilberg, The Destruction of the European Jews (20033); P. Longerich, Politik der Vernichtung. Eine Gesamtdarstellung der nationalsozialistischen Judenverfolgung (1998).
The "Final Solution" The origin of the "Final Solution," the Nazi plan to exterminate the Jewish people, remains uncertain. What is clear is that the genocide of the Jews was the culmination of a decade of Nazi policy, under the rule of Adolf Hitler. The "Final Solution" was implemented in stages. After the Nazi party rise to power, state-enforced racism resulted in anti-Jewish legislation, boycotts, "Aryanization," and finally the "Night of Broken Glass" pogrom, all of which aimed to remove the Jews from German society. After the beginning of World War II, anti-Jewish policy evolved into a comprehensive plan to concentrate and eventually annihilate European Jewry.
Although the composition of the ground, largely sand, was favorable for ground-penetrating radar, the dense forest surrounding the site interfered enough with the radar signals that they decided to try another tack. Paul Bauman and Alastair McClymont, geophysicists with Advisian WorleyParsons, a transnational engineering company, had more luck with electrical resistivity tomography, or ERT, which was originally developed to explore water tables and potential mining sites. ERT technology sends jolts of electrical current into the earth by way of metal electrodes hooked up to a powerful battery and measures the distinctive levels of resistivity of different types of earth; the result is a detailed map to a depth of more than a hundred feet.

The Holocaust, also known as the Shoah,[b] was a genocide during World War II in which Nazi Germany, aided by local collaborators, systematically murdered some six million European Jews—around two-thirds of the Jewish population of Europe—between 1941 and 1945.[a][c] Jews were targeted for extermination as part of a larger event during the Holocaust era, in which Germany and its collaborators persecuted and murdered other groups, including Slavs (chiefly ethnic Poles, Soviet prisoners of war, and Soviet citizens), the Roma, the "incurably sick", political and religious dissenters such as communists and Jehovah's Witnesses, and gay men.[d] Taking into account all the victims of Nazi persecution, the death toll rises to over 17 million.[3]

Life within Nazi concentration camps was horrible. Prisoners were forced to do hard physical labor and given little food. Prisoners slept three or more to a crowded wooden bunk; bedding was unheard of. Torture within the concentration camps was common and deaths were frequent. At a number of concentration camps, Nazi doctors conducted medical experiments on prisoners against their will.
Trainloads of human cargo arriving at Auschwitz went through a selection process conducted by SS doctors such as Josef Mengele. Young adults considered fit for slave labor were allowed to live and had an ID number tattooed on their left forearm. Everyone else went to the gas chambers. A few inmates, including twin children, were occasionally set aside for participation in human medical experiments.
He acted instantly. He sent Otto Frank a copy of “In Search” and in effect offered his services as an unofficial agent to secure British and American publication, asserting his distance from any financial gain; his interest, he said, was purely “one of sympathy.” He saw in the diary the possibility of “a very touching play or film,” and asked Frank’s permission to explore the idea. Frank at first avoided reading Levin’s book, saturated as it was in passions and commitments so foreign to his own susceptibilities. He was not unfamiliar with Levin’s preoccupations; he had seen and liked one of his films. He encouraged Levin to go ahead—though a dramatization, he observed, would perforce “be rather different from the real contents” of the diary. Hardly so, Levin protested: no compromise would be needed; all the diarist’s thoughts could be preserved.
While the labour camps at Auschwitz and Majdanek used inmates for slave labour to support the German war effort, the extermination camps at Belzec, Treblinka, and Sobibor had one task alone: killing. At Treblinka a staff of 120, of whom only 30 were SS (the Nazi paramilitary corps), killed some 750,000 to 925,000 Jews during the camp’s 17 months of operation. At Belzec German records detail a staff of 104, including about 20 SS, who killed some 500,000 Jews in less than 10 months. At Sobibor they murdered between 200,000 and 250,000. These camps began operation during the spring and summer of 1942, when the ghettos of German-occupied Poland were filled with Jews. Once they had completed their missions—murder by gassing, or “resettlement in the east,” to use the language of the Wannsee protocols—the Nazis closed the camps. There were six extermination camps, all in German-occupied Poland, among the thousands of concentration and slave-labour camps throughout German-occupied Europe.
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]