The Yad Vashem Law authorizes Yad Vashem "to confer honorary citizenship upon the Righteous Among the Nations, and if they have died, the commemorative citizenship of the State of Israel, in recognition of their actions". Anyone who has been recognized as "Righteous" is entitled to apply to Yad Vashem for the certificate. If the person is no longer alive, their next of kin is entitled to request that commemorative citizenship be conferred on the Righteous who has died.

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 first such extermination camps were introduced during Operation Reinhardt, which targeted the elimination of the Jewish people within the General Government of Occupied Poland and Ukraine. After the first killing center open at Chelmno, the use of these extermination tactics spread quickly. At the height of deportations, the Birkenau killing center murdered 6,000 Jews a day.
Assistant coroner José António de Mello displays a skull to press photographers at the exhumation site in the Nossa Senhora do Rosário Cemetery, Embu das Artes, Brazil, June 6, 1985. Romeu Tuma, the chief of the federal police in São Paulo, shown standing over the site of the grave as the skull and bones were exhibited to the cameras, told the assembled reporters that Mengele “was well and truly dead.” But this statement was immediately contested, for not everyone was convinced that the bones were Mengele’s.

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.
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]
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]

“Who has made us Jews different from all other people? Who has allowed us to suffer so terribly up until now? It is God who has made us as we are, but it will be God, too, who will raise us up again. Who knows? It might even be our religion from which the world and all peoples learn good, and for that reason and only that reason do we suffer. We can never become just Netherlanders, or just English or representatives of any country for that matter. We will always remain Jews, but we want to, too.” – April 11, 1944

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]