Mengele's research subjects were better fed and housed than the other prisoners, and temporarily spared from execution in the gas chambers.[42] He established a kindergarten for children who were the subjects of his experiments, as well as the preschool children from the Romani camp. The facility provided better food and living conditions than other areas of the camp, and included a children's playground.[43] When visiting his young subjects, he introduced himself as "Uncle Mengele" and offered them sweets,[44] while at the same time being personally responsible for the deaths of an unknown number of victims whom he killed via lethal injection, shootings, beatings, and his deadly experiments.[45] In his 1986 book, Lifton describes Mengele as sadistic, lacking empathy, and extremely antisemitic, believing the Jews should be eliminated entirely as an inferior and dangerous race.[46] Rolf Mengele later claimed that his father had shown no remorse for his wartime activities.[47]
In the summer of 1941, Rudolf Höss, the commandant of Auschwitz, received orders from Heinrich Himmler to begin experimenting with Zyklon B gas. On 3 September 1941, the Auschwitz deputy camp commandant Karl Fritzsch experimented on 600 Russian prisoners of war and 250 Polish inmates by gathering them in the basement of Block 11 and gassing them with Zyklon B.
Being a twin, regardless of age, meant survival in 1944. Some 3,000 children (or about 1,500 sets of twins) were selected for the experiments. They were not terrified of him but rather they were often intimidated by some of what he did. They knew of his temper and his passion for his work. Yet, they were also aware of his role in their survival. "Being on Mengele’s list was better than being on no list," said Eva Mozes Kor.
The Jews of Kiev were rounded up by the Einsatzgruppen for “resettlement” in late September 1941. Thousands of Jews were brought to a ravine on the outskirts of Kiev and mowed down by machine guns. Many who were not wounded, including thousands of children, were thrown into the pit of bodies and were buried alive. According to an account in The Holocaust by Martin Gilbert, Ukrainian militia men joined in the slaughter. The records of the Einsatzgruppen unit which participated in the executions recorded 33,771 Jews killed at Babi Yar on September 29-30. In all, more than 100,000 persons, most of them Jews, were executed at Babi Yar between 1941-1943 by the Nazis. In the summer of 1943, the bodies were dug out by slave labor and burned to hide the evidence of the slaughter.
The killings continued uninterrupted. On 12 October 1941, in Stanisławów, some 10,000–12,000 Jewish men, women, and children were shot at the Jewish cemetery by the German uniformed SS-men and Ukrainian Auxiliary Police during the so-called "Bloody Sunday" (de).[64] The shooters began firing at 12 noon and continued without stopping by taking turns. There were picnic tables set up on the side with bottles of vodka and sandwiches for those who needed to rest from the deafening noise of gunfire.[65] It was the single largest massacre of Polish Jews in Generalgouvernement prior to mass gassings of Aktion Reinhard, which commenced at Bełżec in March 1942. Notably, the extermination operations in Chełmno had begun on 8 December 1941, one-and-a-half month before Wannsee, but Chełmno – located in Reichsgau Wartheland – was not a part of Reinhard, and neither was Auschwitz-Birkenau functioning as an extermination center until November 1944 in Polish lands annexed by Hitler and added to Germany proper.[65][66]
Browning wrestles with these and many other related questions in a consistently persuasive and cogent way. He concludes, very sensibly, that it is inconceivable that the Holocaust, unprecedented in history and entailing a massive, counterproductive diversion of resources in wartime, could have taken place without Hitler’s immediate knowledge and approval, although his orders were often, as Browning notes, “vague and inexplicit.” Moreover, Hitler himself was the chief Nazi ideologue of rabid, demented, racialist anti-Semitism, with anti-Semitism at the very center of his worldview and in and of itself a central motivating factor in his foreign and military policies. 

Jewish prisoners were concentrated at Bergen-Belsen, hitherto not known as one of the worst camps; but in the chaotic final months of the war conditions were allowed to deteriorate catastrophically. When British troops came across the camp on 15 April 1945, they encountered 10,000 unburied corpses, a raging typhus epidemic and 60,000 sick and dying prisoners crammed into overcrowded barracks without food or water.
Grateful for lightness, reviewers agreed. What they came away from was the charm of Susan Strasberg as a radiant Anne, and Joseph Schildkraut in the role of a wise and steadying Otto Frank, whom the actor engagingly resembled. “Anne is not going to her death; she is going to leave a dent on life, and let death take what’s left,” Walter Kerr, on a mystical note, wrote in the Herald Tribune. Variety seemed relieved that the play avoided “hating the Nazis, hating what they did to millions of innocent people,” and instead came off as “glowing, moving, frequently humorous,” with “just about everything one could wish for. It is not grim.” The Daily News confirmed what Kanin had striven for: “Not in any important sense a Jewish play. . . . Anne Frank is a Little Orphan Annie brought into vibrant life.” Audiences laughed and were charmed; but they were also dazed and moved.
^ "War nicht der 'Archipel Gulag' ursprünglicher als 'Auschwitz'? War nicht der 'Klassenmord' der Bolschewiki das logische und faktische Prius des 'Rassenmords' der Nationalsozialisten? Sind Hitlers geheimste Handlungen nicht gerade auch dadurch zu erklären, daß er den 'Rattenkäfig' nicht vergessen hatte? Rührte Auschwitz vielleicht in seinen Ursprüngen aus einer Vergangenheit her, die nicht vergehen wollte?"[477]
Browning’s massive but highly readable work (some parts of which were written by the German scholar Jürgen Matthäus) covers every aspect of this question and incorporates all significant previous research. While new interpretations are, of course, likely to be offered in the future, it is most unlikely, barring the discovery of new documents of great importance, that we will ever have a clearer picture of this process than the one Browning offers. This is not to say that the evolution of Nazi policy towards the Jews in this period is now crystal clear”it emphatically is not”but it is to say that all the evidence that an historian can bring to bear on this question has now been synthesized in the clearest form it is ever likely to have.
The German view of the Roma as hereditary criminals and "asocials" was reflected in their classification in the concentration camps, where they were usually counted among the asocials and given black triangles to wear.[420] According to Niewyk and Nicosia, at least 130,000 died out of nearly one million in German-occupied Europe.[415] The United States Holocaust Memorial Museum calculates at least 220,000.[421] Ian Hancock, who specializes in Romani history and culture, argues for between 500,000 and 1,500,000.[422] The treatment of the Roma was not consistent across German-occupied territories. Those in France and the Low Countries were subject to restrictions on movement and some confinement to collection camps, while those in Central and Eastern Europe were sent to concentration camps and murdered by soldiers and execution squads.[423] Before being sent to the camps, the Roma were herded into ghettos, including several hundred into the Warsaw Ghetto.[219] Further east, teams of Einsatzgruppen tracked down Romani encampments and murdered the inhabitants on the spot, leaving no records of the victims.[423] After the Germans occupied Hungary, 1,000 Roma were deported to Auschwitz.[424][x]

On July 5, 1942, Anne's older sister Margot received an official summons to report to a Nazi work camp in Germany, and on July 6, Margot and Anne went into hiding with their father Otto and mother Edith. They were joined by Hermann van Pels, Otto's business partner, including his wife Auguste and their teenage son Peter.[12] Their hiding place was in the sealed-off upper rooms of the annex at the back of Otto's company building in Amsterdam.[12][13] Otto Frank started his business, named Opekta, in 1933. He was licensed to manufacture and sell pectin, a substance used to make jam. He stopped running his business while everybody was in hiding. But once he returned, he found his employees running it. The rooms that everyone hid in were concealed behind a movable bookcase in the same building as Opekta. Mrs. van Pels's dentist, Fritz Pfeffer, joined them four months later. In the published version, names were changed: The van Pelses are known as the Van Daans, and Fritz Pfeffer as Albert Dussel. With the assistance of a group of Otto Frank's trusted colleagues, they remained hidden for two years and one month.
According to the Yad Vashem Holocaust Martyrs' and Heroes' Remembrance Authority in Jerusalem, "[a]ll the serious research" confirms that between five and six million Jews died.[391] Early postwar calculations were 4.2 to 4.5 million from Gerald Reitlinger;[392] 5.1 million from Raul Hilberg; and 5.95 million from Jacob Lestschinsky.[393] In 1986 Lucy S. Dawidowicz used the pre-war census figures to estimate 5.934 million.[394] Yehuda Bauer and Robert Rozett in the Encyclopedia of the Holocaust (1990) estimated 5.59–5.86 million.[395] A 1996 study led by Wolfgang Benz suggested 5.29 to 6.2 million, based on comparing pre- and post-war census records and surviving German documentation on deportations and killings.[391] Martin Gilbert arrived at a minimum of 5.75 million.[396] The figures include over one million children.[397]
Amir told me that Zeidel made several pilgrimages back to Ponar. And yet he was never able to locate the passageway that carried him to freedom. What Zeidel didn’t know was that three years before he died, a Lithuanian archaeologist named Vytautas Urbanavicius had quietly excavated what turned out to be the tunnel’s entrance. But after taking a few photographs and a notebook’s worth of measurements, he sealed up the hole with fresh mortar and stone without pressing any farther or prominently marking the area.
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.
In June 1941 Germany attacked the Soviet Union and began the "Final Solution." Four mobile killing groups were formed called Einsatzgruppen A, B, C and D. Each group contained several commando units. The Einsatzgruppen gathered Jews town by town, marched them to huge pits dug earlier, stripped them, lined them up, and shot them with automatic weapons. The dead and dying would fall into the pits to be buried in mass graves. In the infamous Babi Yar massacre, near Kiev, 30,000-35,000 Jews were killed in two days. In addition to their operations in the Soviet Union, the Einsatzgruppen conducted mass murder in eastern Poland, Estonia, Lithuania and Latvia. It is estimated that by the end of 1942, the Einsatzgruppen had murdered more than 1.3 million Jews.

The unabashed triflings of Cara Wilson—whose “identification” with Anne Frank can be duplicated by the thousand, though she may be more audacious than most—point to a conundrum. Never mind that the intellectual distance between Wilson and Anne Frank is immeasurable; not every self-conscious young girl will be a prodigy. Did Otto Frank not comprehend that Cara Wilson was deaf to everything the loss of his daughter represented? Did he not see, in Wilson’s letters alone, how a denatured approach to the diary might serve to promote amnesia of what was rapidly turning into history? A protected domestic space, however threatened and endangered, can, from time to time, mimic ordinary life. The young who are encouraged to embrace the diary cannot always be expected to feel the difference between the mimicry and the threat. And (like Cara Wilson) most do not. Natalie Portman, sixteen years old, who will début as Anne Frank in the Broadway revival this December of the famous play based on the diary—a play that has itself influenced the way the diary is read—concludes from her own reading that “it’s funny, it’s hopeful, and she’s a happy person.”
The Summer Olympics in Berlin gave the Nazis a platform to project a crafted image to the world. Despite calls for boycotts, the games were a success. Anti-Jewish notices were removed and German spectators cheered black athlete Jesse Owens to four gold medals. Visitors saw a tolerant Reich. However, three days after the games ended, the head of the Olympic Village, Wolfgang Fürstner, killed himself as he would soon be dismissed due to his Jewish ancestry under the Nuremberg Laws.

Browning’s massive but highly readable work (some parts of which were written by the German scholar Jürgen Matthäus) covers every aspect of this question and incorporates all significant previous research. While new interpretations are, of course, likely to be offered in the future, it is most unlikely, barring the discovery of new documents of great importance, that we will ever have a clearer picture of this process than the one Browning offers. This is not to say that the evolution of Nazi policy towards the Jews in this period is now crystal clear”it emphatically is not”but it is to say that all the evidence that an historian can bring to bear on this question has now been synthesized in the clearest form it is ever likely to have.

When did the Nazis decide to kill all the Jews of Europe? Was murder always in the mind of Adolf Hitler? These are some of the most difficult questions historians have to answer. Certainly, up until the invasion of the Soviet Union, Jews did manage to emigrate from Germany. Historians will never know precisely when the order for mass killing was given, but large-scale murders began with the invasion of Russia.
The mass killings of Jews in the occupied Soviet territories were assigned to four SS formations called Einsatzgruppen ("task groups"), which were under Heydrich's overall command. Similar formations had been used to a limited extent in Poland in 1939, but the ones operating in the Soviet territories were much larger.[242] The Einsatzgruppen's commanders were ordinary citizens: the great majority were professionals and most were intellectuals.[243] By the winter of 1941–1942, the four Einsatzgruppen and their helpers had killed almost 500,000 people.[244] The largest massacre of Jews by the mobile killing squads in the Soviet Union was at a ravine called Babi Yar outside Kiev,[245] where 33,771 Jews were killed in a single operation on 29–30 September 1941.[246][n] A mixture of SS and Security Police, assisted by Ukrainian police, carried out the killings.[248] Although they did not actively participate in the killings, men of the German 6th Army helped round up the Jews of Kiev and transport them to be shot.[249] By the end of the war, around two million are thought to have been victims of the Einsatzgruppen and their helpers in the local population and the German Army. Of those, about 1.3 million were Jews and up to a quarter of a million Roma.[250]
You find the stories of Irena Sendler, who defied the Nazis and saved 2,500 Jewish children by smuggling them out of the Warsaw Ghetto .. Maria von Maltzan, who risked everything to defy Hitler and the Nazi Régime .. Miep Gies, who risked her life daily to hide Anne Frank and her family .. the Rescue of the Danish Jews, Varian Fry, the American Schindler,  Kurt Gerstein SS Officer, the site Courage and Survival ..
Walking the grounds of the memorial site, I arrived with Freund at the lip of the pit that had housed the bunker where Zeidel and the other members of the Burning Brigade had lived. The circumference was tremendous, nearly 200 feet in total. On its grassy floor, the Vilna Gaon Museum had erected a model of a double-sided ramp that the Burning Brigade had used to drop bodies onto the pyres.
In early 1943, encouraged by von Verschuer, Mengele applied to transfer to the concentration camp service.[20][30] His application was accepted and he was posted to Auschwitz, where he was appointed by SS-Standortarzt Eduard Wirths, chief medical officer at Auschwitz, to the position of chief physician of the Zigeunerfamilienlager (Romani family camp) at Birkenau,[20][30] a subcamp located on the main Auschwitz complex. The SS doctors did not administer treatment to the Auschwitz inmates, but supervised the activities of inmate doctors who had been forced to work in the camp medical service.[31] As part of his duties, Mengele made weekly visits to the hospital barracks and ordered any prisoners who had not recovered after two weeks in bed to be sent to the gas chambers.[32]