To remain efficient, the SS death factories required a steady supply of humans. To coordinate the flow of people to the gas chambers, Höss and fellow commandants relied on SS-Obersturmbannführer Adolf Eichmann, who became a central figure in the day-to-day management of the Final Solution. Present at the Wannsee Conference, Eichmann assumed the leading role in facilitating the deportation of Jews from every corner of Europe. With boundless enthusiasm for his task and fanatical efficiency, Eichmann traveled the continent, insuring that trainload after trainload departed. "The trains," Eichmann said later, "ran like a dream."

Mengele’s crimes had been well documented before the International Military Tribunal (IMT) and other postwar courts. West German authorities issued a warrant for his arrest in 1959, and a request for extradition in 1960. Alarmed by the capture of Adolf Eichmann in Buenos Aires in that same year, Mengele moved to Paraguay and then to Brazil. He spent the last years of his life near Sao Pãolo. In declining health, Mengele suffered a stroke and drowned while swimming at a vacation resort near Bertioga, Brazil, on February 7, 1979. He was buried in a suburb of Sao Pãolo under the fictive name “Wolfgang Gerhard.”
The Nazis used the phrase Lebensunwertes Leben (life unworthy of life) in reference to the disabled and mentally ill.[92] On 14 July 1933, the Law for the Prevention of Hereditarily Diseased Offspring (Gesetz zur Verhütung erbkranken Nachwuchses), the Sterilization Law, was passed, allowing for compulsory sterilization.[93][94] The New York Times reported on 21 December that year: "400,000 Germans to be sterilized".[95] There were 84,525 applications from doctors in the first year. The courts reached a decision in 64,499 of those cases; 56,244 were in favor of sterilization.[96] Estimates for the number of involuntary sterilizations during the whole of the Third Reich range from 300,000 to 400,000.[97]
Another survivor of Auschwitz-Birkenau was Regina Bialek, a Polish political prisoner, who was saved from the gas chamber at the last moment by Dr. Josef Mengele. Bialek gave a deposition which was entered into the British Trial of Josef Kramer and Forty-Four Others, also known as The Belsen Trial, which took place in 1945 after the end of World War II. According to Bialek's testimony, the gassing of the Jews at Birkenau did not stop, even on Christmas day.
Here the prophet Isaiah is offering reassurance to two classes of people. The first is the nekhar, or alien, a word that in this context clearly refers to a Gentile (as it does elsewhere in the Bible). While such a person—the reference may be to a convert or to one taking on the intermediate status of a God-fearing non-Jew—might fear that not being born a Jew places an insurmountable barrier between him and God, the prophet assures him to the contrary.

Mengele joined the Nazi Party in 1937 and the Schutzstaffel (SS; protection squadron) in 1938. He received basic training in 1938 with the Gebirgsjäger (light infantry mountain troop) and was called up for service in the Wehrmacht (Nazi armed forces) in June 1940, some months after the outbreak of World War II. He soon volunteered for medical service in the Waffen-SS, the combat arm of the SS, where he served with the rank of SS-Untersturmführer (second lieutenant) in a medical reserve battalion until November 1940. He was next assigned to the SS-Rasse- und Siedlungshauptamt (SS Race and Settlement Main Office) in Poznań, evaluating candidates for Germanization.[18][19]