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]

Today, I am going to refer quite frankly to a very grave chapter. We can mention it now among ourselves quite openly and yet we shall never talk about it in public. I'm referring to the evacuation of the Jews, the extermination of the Jewish people. Most of you will know what it's like to see 100 corpses side by side or 500 corpses or 1,000 of them. To have coped with this and—except for cases of human weakness—to have remained decent, that has made us tough. This is an unwritten—never to be written—and yet glorious page in our history.[127]
But the exhortations of both Isaiah and the Jerusalem Talmud would also seem to apply, collectively and individually, to the thousands of Poles who saved Jews, often exposing themselves to considerably greater danger than those who acted similarly in Nazi-occupied Western Europe. Nor is the message of these passages limited to acts of heroic selflessness during the Shoah. Think, for instance, of Zidan Saif, the Druze policeman who gave his life defending a Jerusalem synagogue against terrorists in 2014—or, in the realm of power politics, of those many Gentiles, from Arthur Balfour to Harry Truman to Daniel P. Moynihan, who at decisive moments in history have spoken up for the Jewish people and the Jewish state.
Below are figures for the number of Jews murdered in each country that came under German domination. They are estimates, as are all figures relating to Holocaust victims. The numbers given here for Czechoslovakia, Hungary and Romania are based on their territorial borders before the 1938 Munich agreement. The total number of six million Jews murdered during the Holocaust, which emerged from the Nuremberg trials, is also an estimate. Numbers have ranged between five and seven million killed.

The Nazis then combined their racial theories with the evolutionary theories of Charles Darwin to justify their treatment of the Jews. The Germans, as the strongest and fittest, were destined to rule, while the weak and racially adulterated Jews were doomed to extinction. Hitler began to restrict the Jews with legislation and terror, which entailed burning books written by Jews, removing Jews from their professions and public schools, confiscating their businesses and property and excluding them from public events. The most infamous of the anti-Jewish legislation were the Nuremberg Laws, enacted on September 15, 1935. They formed the legal basis for the Jews' exclusion from German society and the progressively restrictive Jewish policies of the Germans.
I simply can't build up my hopes on a foundation consisting of confusion, misery and death, I see the world gradually being turned into a wilderness, I hear the ever approaching thunder, which will destroy us too, I can feel the sufferings of millions and yet, if I look up into the heavens, I think that it will all come right, that this cruelty too will end, and that peace and tranquility will return again. In the meantime, I must uphold my ideals, for perhaps the time will come when I shall be able to carry them out.
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.

The most notorious physician was Josef Mengele, an SS officer who became the Auschwitz camp doctor on 30 May 1943.[54] Interested in genetics[54] and keen to experiment on twins, he would pick out subjects from the new arrivals during "selection" on the ramp, shouting "Zwillinge heraus!" (twins step forward!).[55] They would be measured, killed, and dissected. One of Mengele's assistants said in 1946 that he was told to send organs of interest to the directors of the "Anthropological Institute in Berlin-Dahlem". This is thought to refer to Mengele's academic supervisor, Otmar Freiherr von Verschuer , director from October 1942 of the Kaiser Wilhelm Institute of Anthropology, Human Heredity, and Eugenics in Berlin-Dahlem.[56][55][i] Mengele's experiments included placing subjects in pressure chambers, testing drugs on them, freezing them, attempting to change their eye color by injecting chemicals into children's eyes, and amputations and other surgeries.[59]

^ Maurielle Lue (2013-04-24). "Northville mother files complaint about passages in the unedited version of The Diary of Anne Frank". WJBK – Fox 2 News. Archived from the original on 2013-05-02. Retrieved 2013-05-02. The following is the passage from The Definitive Edition of the Diary of a Young Girl that has a mother in Northville filing a formal complaint. 'Until I was eleven or twelve, I didn't realize there was a second set of labia on the inside, since you couldn't see them. What's even funnier is that I thought urine came out of the clitoris…. When you're standing up, all you see from the front is hair. Between your legs there are two soft, cushiony things, also covered with hair, which press together when you're standing, so you can't see what's inside. They separate when you sit down and they're very red and quite fleshy on the inside. In the upper part, between the outer labia, there's a fold of skin that, on second thought, looks like a kind of blister. That's the clitoris.'

When exactly Hitler settled on straightforward murder as a means of removal has been harder to pinpoint. As Yale historian Timothy Snyder writes, “It cannot be stressed enough that the Nazis did not know how to eradicate the Jews when they began the war against the Soviet Union [in the summer of 1941]… They could not be confident that SS men would shoot women and children in large numbers.” But as Operation Barbarossa, the name for the Nazi invasion of the U.S.S.R, proved during the mass shootings of June 1941 and the massacres at Kiev in September, the Order Police and Einsatzgrüppen were more than willing to commit mass murders. This meant Hitler could take the solution to the Jewish problem to its “furthest extremes,” in the words of Philipp Bouhler, the senior Nazi official responsible for the euthanasia program that killed more than 70,000 handicapped German people.
Josef Mengele (/ˈmɛŋɡələ/; German: [ˈmɛŋələ]; 16 March 1911 – 7 February 1979) was a German Schutzstaffel (SS) officer and physician in Auschwitz concentration camp during World War II. He performed deadly human experiments on prisoners and was a member of the team of doctors who selected victims to be killed in the gas chambers. Arrivals that were judged able to work were admitted into the camp, while those deemed unsuitable for labor were sent to the gas chambers to be killed. With Red Army troops sweeping through Poland, Mengele was transferred 280 kilometers (170 mi) from Auschwitz to the Gross-Rosen concentration camp on 17 January 1945, just ten days before the arrival of the Soviet forces at Auschwitz. After the war, he fled to South America where he evaded capture for the rest of his life.