Twins were subjected to weekly examinations and measurements of their physical attributes by Mengele or one of his assistants.[49] The experiments he performed on twins included unnecessary amputation of limbs, intentionally infecting one twin with typhus or some other disease, and transfusing the blood of one twin into the other. Many of the victims died while undergoing these procedures,[50] and those who survived the experiments were sometimes killed and their bodies dissected once Mengele had no further use for them.[51] Nyiszli recalled one occasion on which Mengele personally killed fourteen twins in one night by injecting their hearts with chloroform.[31] If one twin died from disease, he would kill the other twin to allow comparative post-mortem reports to be produced for research purposes.[52]

First, the rescuer must have been actively involved in saving Jews from the threat of death or deportation to concentration camps or killing centers. Second, the rescuer must have risked their own life or liberty in their attempt to save Jews. Third, the original motive for rescue must have been to protect and save Jews from the Holocaust. Other motivations, not considered for qualification, include financial gain, protecting Jews in order to convert them to Christianity, taking a Jewish child with the intention of adoption, or rescuing individuals during resistance activities that were not explicitly geared towards rescuing Jews. Finally, there must be first-hand testimony from those rescued to verify the individual's role in the rescue. If testimony does not exist or cannot be found, there must be irrefutable documentation of the individual's participation in the rescue and the conditions surrounding it.

When Menachem Begin came to power in 1977, he wanted a change. He made that clear in an early meeting with Yitzhak Hofi, who was then the director of the Mossad. “When Begin came in, he thought that not enough was being done and that there was a need to go on hunting Nazis,” Hofi later said in a classified interview with the Menachem Begin Heritage Center. “I told him, ‘Prime minister, today the Mossad has other missions that concern the national security of the people of Israel today and tomorrow, and I give preference to today and tomorrow over yesterday.’ ” Begin didn’t appreciate that response. “In the end we decided that we would focus on one more target, Mengele, but Begin, who was a very emotional man, was disappointed,” Hofi said.
And so, at the behest of their Führer, a handful of Nazi bureaucrats conspired to bring about the demise of millions. On January 20, 1942, they attended the Wannsee Conference in Berlin, organized by SS-Obergruppenführer Reinhard Heydrich, who told them, “In the course of the practical execution of the Final Solution, Europe will be combed through from west to east.”
But Auschwitz-Birkenau became more than a concentration camp. In the spring of 1942 gas chambers were built at Birkenau and mass transports of Jews began to arrive. Some of the new arrivals were inducted into the camp as registered prisoners, but the great majority were gassed immediately. These gassing operations were greatly expanded in the spring of 1943 with the construction of four purpose-built gas chamber and crematorium complexes, which included such refinements as electric lifts to carry bodies up to the crematoria. Each crematorium could handle 2,000 victims daily. In a nearby group of barracks, nicknamed 'Canada' by the prisoners, victims' belongings were sorted for transportation to the Reich. The victims' hair was used to stuff mattresses; gold teeth were melted down and the gold deposited to an SS account.

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 most ghettos, Nazis ordered the Jews to establish a Judenrat (Jewish council) to administer Nazi demands and to regulate the internal life of the ghetto. The Nazis routinely ordered deportations from the ghettos. In some of the large ghettos, 1,000 people per day were sent by rail to concentration and extermination camps. To get them to cooperate, the Nazis told the Jews they were being transported elsewhere for labor.
In June 1941, Mengele was posted to Ukraine, where he was awarded the Iron Cross 2nd Class. In January 1942, he joined the 5th SS Panzer Division Wiking as a battalion medical officer. After rescuing two German soldiers from a burning tank, he was decorated with the Iron Cross 1st Class, the Wound Badge in Black, and the Medal for the Care of the German People. He was declared unfit for further active service in mid-1942, when he was seriously wounded in action near Rostov-on-Don. Following his recovery, he was transferred to the headquarters of the SS Race and Settlement Main Office in Berlin, at which point he resumed his association with von Verschuer, who was now director of the Kaiser Wilhelm Institute of Anthropology, Human Heredity, and Eugenics. Mengele was promoted to the rank of SS-Hauptsturmführer (captain) in April 1943.[20][21][22]