Double-sided ramps were built inside the pits. One crew hauled stretchers filled with corpses up the ramp, and another crew pushed the bodies onto the pyre. In a week, the Burning Brigade might dispose of 3,500 bodies or more. Later, the guards forced prisoners to sift through the ashes with strainers, looking for bone fragments, which would then be pounded down into powder.
From the Kristallnacht pogrom onwards, Nazi policy toward the Jews radicalized relentlessly, reaching deliberate continental genocide of a kind never before seen in history by 1941-1942. It is here, however, that considerable difference of opinion among historians begins. Over the past twenty years or so, a consensus has emerged that Hitler did not embark on his campaign of killing all Jews in the Soviet Union, including women and children, immediately after the invasion began in June 1941, but only several months later. At first, it seems, only adult male Jews and “commissars” (Soviet state operatives) were killed; one of the best-known recent expositions of this viewpoint is Philippe Burrin’s 1994 Hitler and the Jews: The Genesis of the Holocaust . Nearly all of the detailed documentation of the Holocaust, including recently discovered records, points to this conclusion. Nonetheless, by the end of 1941, Nazi killing squads ( Einsatzgruppen ) had killed hundreds of thousands of Jews in the western Soviet Union, murdering men, women, and children indiscriminately. Beginning in early 1942, the extermination camps (all located in conquered Poland) began to murder Jews, and others, brought in from all parts of Europe.
Any remaining notes Mengele carried with him on his escape to South America and those were never found. Some forty years after the war, only a few of these twins could be found, many living in Israel and the United States. Strangely enough, many of them recall Mengele as a gentle, affable man who befriended them as children and gave them chocolates. Since many had immediately been separated from their families upon entering the camp, Mengele became a sort of father figure. Still a tension existed, that at any time they could be killed if they did not keep a low profile. Older twins recognized his kindness as a deception ...
I bought this book to prepare for a trip to the Anne Frank Museum. It was a sad but fascinating read - and when I got to the Franks' hiding place in Amsterdam, I knew exactly what I was looking at, who slept where - and who all the individuals were that helped Anne, her family, and their companions survive for as long as they did. I think I got more out of the visit than I would have without reading this book.
After the war, Dr. Josef Mengele worked on a farm under an assumed name for a few years, then escaped to South America; he was never put on trial as a war criminal. If he had been captured and put on trial, Dr. Gisella Perl was prepared to testify against him. Dr. Perl worked as a prison doctor under Dr. Mengele, and was a prisoner herself. According to the book "Mengele, the Complete Story," Dr. Perl claimed that a woman prisoner named Ibi had escaped the gas chamber six times by jumping off the truck that was taking the prisoners from the Judenrampe to the gas chambers; Dr. Mengele was enraged when he discovered that she had returned to the selection line.
Polish gentiles who rescued Jews had several obstacles to overcome. The most serious were the German laws against protecting Jews and the corresponding obligation to identify those who violated these laws. On 15 October 1941, the Nazis introduced a widely publicized law making unauthorized Jewish movement outside ghettos a crime punishable by death. The same punishment applied to gentiles who helped Jews escape. Transgressions were promptly followed by executions that were also widely publicized.
The infamous 'Gate of Death' at Auschwitz II for the incoming freight trains was built of brick and cement mortar in 1943, and the three-track rail spur was added.[100] Until mid-August, 45,000 Thessaloniki Jews were murdered in a mere six months,[99] including over 30,000 Jews from Sosnowiec (Sosnowitz) and Bendzin Ghettos.[101] The spring of 1944 marked the beginning of the last phase of the Final Solution at Birkenau. The new big ramps and sidings were constructed, and two freight elevators were installed inside Crematoria II and III for moving the bodies faster. The size of the Sonderkommando was nearly quadrupled in preparation for the Special Operation Hungary (Sonderaktion Ungarn). In May 1944, Auschwitz-Birkenau became the site of one of the two largest mass murder operations in modern history, after the Großaktion Warschau deportations of the Warsaw Ghetto inmates to Treblinka in 1942. It is estimated that until July 1944 approximately 320,000 Hungarian Jews were gassed at Birkenau in less than eight weeks.[100] The entire operation was photographed by the SS.[102] In total, between April and November 1944, Auschwitz II received over 585,000 Jews from over a dozen regions as far as Greece, Italy, and France, including 426,000 Jews from Hungary, 67,000 from Łódź, 25,000 from Theresienstadt, and the last 23,000 Jews from the General Government.[103] Auschwitz was liberated by the Red Army on 27 January 1945, when the gassing had already stopped.[104]
The first killing center set up in occupied Polish lands was the camp at Chełmno on the Ner; Jews brought in from the ghettos in the Wartheland were being killed there from December 1941. Three more camps, somewhat larger, were opened at Bełżec, Sobibor, and Treblinka (in what was known as “Aktion Reinhard”) somewhat later, between March and July 1942.

The Nazis then combined their racial theories with the evolutionary theories of Charles Darwin to justify their treatment of the Jews. The Germans, as the strongest and fittest, were destined to rule, while the weak and racially adulterated Jews were doomed to extinction. Hitler began to restrict the Jews with legislation and terror, which entailed burning books written by Jews, removing Jews from their professions and public schools, confiscating their businesses and property and excluding them from public events. The most infamous of the anti-Jewish legislation were the Nuremberg Laws, enacted on September 15, 1935. They formed the legal basis for the Jews' exclusion from German society and the progressively restrictive Jewish policies of the Germans.

During the era of the Holocaust, German authorities also targeted other groups because of their perceived racial and biological inferiority: Roma (Gypsies), people with disabilities, and some of the Slavic peoples (Poles, Russians, and others). Other groups were persecuted on political, ideological, and behavioral grounds, among them Communists, Socialists, Jehovah's Witnesses, and homosexuals.
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]