Inside the Soviet Union were an estimated three million Jews, many of whom still lived in tiny isolated villages known as Shtetls. Following behind the invading German armies, four SS special action units known as Einsatzgruppen systematically rounded-up and shot all of the inhabitants of these Shtetls. Einsatz execution squads were aided by German police units, local ethnic Germans, and local anti-Semitic volunteers. Leaders of the Einsatzgruppen also engaged in an informal competition as to which group had the highest tally of murdered Jews.
Almost all Jews within areas occupied by the Germans were killed. There were 3,020,000 Jews in the Soviet Union in 1939, and the losses were 1–1.1 million.[400] Around one million Jews were killed by the Einsatzgruppen in the occupied Soviet territories.[401][402] Of Poland's 3.3 million Jews, about 90 percent were killed.[369] Many more died in the ghettos of Poland before they could be deported.[403] The death camps accounted for half the number of Jews killed; 80–90 percent of death-camp victims are estimated to have been Jews.[394] At Auschwitz-Birkenau the Jewish death toll was 1.1 million;[286][404] Treblinka 870,000–925,000;[405] Bełżec 434,000–600,000;[406][287] Chełmno 152,000–320,000;[407][288] Sobibór 170,000–250,000;[408][291] and Majdanek 79,000.[289]
Hitler's first step was to take the Jews civil rights away. then he branded and labeled them as if they were cattle. Then he sent them to death and labor camps. If they were they were sent to ghettos. in 1941 most of the Jewish population in Germany would be sent to camps. Nazis racial policies took over everything to try and find a solution for the Jewish question. the Nazis tried to separate them and force migration but when this did not work they found a final solution to the Jewish question. This was the murdering of the Jews in Europe. No-one knows when this decision was made but when the ghettos were built Heydrich said '' this is one step closer to the final aim''.    
^ Kwiet, Konrad (1998). "Rehearsing for Murder: The Beginning of the Final Solution in Lithuania in June 1941". Holocaust and Genocide Studies. 12 (1): 3–26. doi:10.1093/hgs/12.1.3. and Kwiet, Konrad (4 December 1995). The Onset of the Holocaust: The Massacres of Jews in Lithuania in June 1941. J. B. and Maurice Shapiro Senior Scholar-in-Residence at the United States Holocaust Memorial Museum (Annual lecture). Published under the same title, but expanded in Bonnell, Andrew, ed. (1996). Power, Conscience and Opposition: Essays in German History in Honour of John A Moses. New York: Peter Lang. pp. 107–21.
In 1947, the seemingly everyday, innocent thoughts of a teen girl were published. But they weren’t so everyday: they were the thoughts of Anne Frank, a 13-year-old in a unique position to make the world understand what it was like to have to hide your entire existence in exchange for a mere chance at surviving the Nazi regime. Her diary has since sold more than 30 million copies and has been translated into 67 languages. If you haven’t read The Diary of a Young Girl in a while (or even if you have), here are 10 things you should know.

Gentiles whose status placed them on the periphery of a community generally had fewer social constraints and a higher level of independence. This sense of independence, in turn, seems to have made many rescuers more likely to act in accordance with their personal values and moral precepts, even when these standards were in opposition to societal norms. Such rescuers were propelled by values connected to self-approval. In interviews, they insisted again and again that they had to be at peace with themselves, with their ideas of what was right or wrong.
The word “Holocaust,” from the Greek words “holos” (whole) and “kaustos” (burned), was historically used to describe a sacrificial offering burned on an altar. Since 1945, the word has taken on a new and horrible meaning: the mass murder of some 6 million European Jews (as well as millions of others, including Gypsies and homosexuals) by the German Nazi regime during the Second World War. To the anti-Semitic Nazi leader Adolf Hitler, Jews were an inferior race, an alien threat to German racial purity and community. After years of Nazi rule in Germany, during which Jews were consistently persecuted, Hitler’s “final solution”–now known as the Holocaust–came to fruition under the cover of world war, with mass killing centers constructed in the concentration camps of occupied Poland.

The killings continued uninterrupted. On 12 October 1941, in Stanisławów, some 10,000–12,000 Jewish men, women, and children were shot at the Jewish cemetery by the German uniformed SS-men and Ukrainian Auxiliary Police during the so-called "Bloody Sunday" (de).[64] The shooters began firing at 12 noon and continued without stopping by taking turns. There were picnic tables set up on the side with bottles of vodka and sandwiches for those who needed to rest from the deafening noise of gunfire.[65] It was the single largest massacre of Polish Jews in Generalgouvernement prior to mass gassings of Aktion Reinhard, which commenced at Bełżec in March 1942. Notably, the extermination operations in Chełmno had begun on 8 December 1941, one-and-a-half month before Wannsee, but Chełmno – located in Reichsgau Wartheland – was not a part of Reinhard, and neither was Auschwitz-Birkenau functioning as an extermination center until November 1944 in Polish lands annexed by Hitler and added to Germany proper.[65][66]
By then, Palestinian terrorism had become Israel’s main security challenge, and the Mossad devoted most of its efforts to that threat. For the next 10 years, backed by Eshkol and his successors as prime minister, Golda Meir and Yitzhak Rabin, almost nothing was done about Mengele. The surge in terrorism, the surprise Yom Kippur War in 1973 and the Syrian military buildup with Soviet assistance took precedence.
In early 1943, encouraged by von Verschuer, Mengele applied to transfer to the concentration camp service.[20][30] His application was accepted and he was posted to Auschwitz, where he was appointed by SS-Standortarzt Eduard Wirths, chief medical officer at Auschwitz, to the position of chief physician of the Zigeunerfamilienlager (Romani family camp) at Birkenau,[20][30] a subcamp located on the main Auschwitz complex. The SS doctors did not administer treatment to the Auschwitz inmates, but supervised the activities of inmate doctors who had been forced to work in the camp medical service.[31] As part of his duties, Mengele made weekly visits to the hospital barracks and ordered any prisoners who had not recovered after two weeks in bed to be sent to the gas chambers.[32]