Mengele sailed to Argentina in July 1949, assisted by a network of former SS members. He initially lived in and around Buenos Aires, then fled to Paraguay in 1959 and Brazil in 1960, while being sought by West Germany, Israel, and Nazi hunters such as Simon Wiesenthal who wanted to bring him to trial. He eluded capture in spite of extradition requests by the West German government and clandestine operations by the Israeli intelligence agency Mossad. He drowned in 1979 after suffering a stroke while swimming off the Brazilian coast, and was buried under a false name. His remains were disinterred and positively identified by forensic examination in 1985.
From 1933 until 1938, most of the people held in concentration camps were political prisoners and people the Nazis labeled as "asocial." These included the disabled, the homeless, and the mentally ill. After Kristallnacht in 1938, the persecution of Jews became more organized. This led to the exponential increase in the number of Jews sent to concentration camps.

It is the shamelessness of appropriation. Who owns Anne Frank? The children of the world, say the sentimentalists. A case in point is the astonishing correspondence, published in 1995 under the title “Love, Otto,” between Cara Wilson, a Californian born in 1944, and Otto Frank, the father of Anne Frank. Wilson, then twelve-year-old Cara Weiss, was invited by Twentieth Century Fox to audition for the part of Anne in a projected film version of the diary. “I didn’t get the part,” the middle-aged Wilson writes, “but by now I had found a whole new world. Anne Frank’s diary, which I read and reread, spoke to me and my dilemmas, my anxieties, my secret passions. She felt the way I did. . . .I identified so strongly with this eloquent girl of my own age, that I now think I sort of became her in my own mind.” And on what similarities does Wilson rest her acute sense of identification with a hunted child in hiding?
At the Wannsee Conference on January 20, 1942 in Wannsee, a Berlin suburb, the details of the “Final Solution” were worked out. The meeting was convened by Reinhard Heydrich, who was the head of the S.S. main office and S.S. Chief Heinrich Himmler’s top aide. The purpose of the meeting was to coordinate the Nazi bureaucracy required to carry out the “Final Solution,” which provided for:
Before the war, Mengele had received doctorates in anthropology and medicine, and began a career as a researcher. He joined the Nazi Party in 1937 and the SS in 1938. He was assigned as a battalion medical officer at the start of World War II, then transferred to the Nazi concentration camps service in early 1943 and assigned to Auschwitz, where he saw the opportunity to conduct genetic research on human subjects. His subsequent experiments focused primarily on twins, with little regard for the health or safety of the victims.[2][3]