They were dependent on the general political and military situation. Helping Jews was thus more successful as liberation approached than in the early days of the war. Later in the war, the time required in hiding was shorter, support from local resistance movements was better organized, and the degree of popular hostility to rescue was muted by imminent military defeat.
After the end of World War II, surviving archival documents provided a clear record of the Final Solution policies and actions of Nazi Germany. They included the Wannsee Conference Protocol, which documented the co-operation of various German state agencies in the SS-led Holocaust, as well as some 3,000 tons of original German records captured by Allied armies,[23][29] including the Einsatzgruppen reports, which documented the progress of the mobile killing units assigned, among other tasks, to kill Jewish civilians during the attack on the Soviet Union in 1941. The evidential proof which documented the mechanism of the Holocaust was submitted at Nuremberg.[29]
German officers raided the building and made arrests on August 4, 1944. The arresting officer, Karl Silberbauer, later said he vividly remembered arresting the Franks, and even told Otto Frank, “What a lovely daughter you have.” When Silberbauer’s actions were discovered in 1963, he was suspended from his job at the Viennese police force. He is quoted as saying, “Why pick on me after all these years? I only did my duty. Now I am suspended and I have just bought some new furniture and how am I going to pay for it?" After an investigation, he was allowed to return to his job.
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.
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''.    
Before the start of World War II, around 9.5 million Jewish people lived in Europe. By the time the war ended, the Nazis had killed 6 million European Jews in concentration camps, or pogroms, or ghettos, or mass executions in what we refer to today as the Holocaust. The Nazis used the term Endlösung, or Final Solution, as the “answer” to the “Jewish question.” But when did this monstrous plan get put in motion?
Otto Frank later described what it was like when the Nazis entered the annex in which he had been hiding. He said an SS man picked up a portfolio and asked whether there were any jewels in it. When Otto Frank said it only contained papers, the SS man threw the papers (and Anne Frank’s diary) on the floor, walking away with silverware and a candlestick in his briefcase. “If he had taken the diary with him,” Otto Frank recalled, “no one would ever have heard of my daughter.”
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]