^ Goebbels noted: "Regarding the Jewish question, the Fuhrer is determined to clear the table. He warned the Jews that if they were to cause another world war, it would lead to their own destruction. Those were not empty words. Now the world war has come. The destruction of the Jews must be its necessary consequence. We cannot be sentimental about it. It is not for us to feel sympathy for the Jews. We should have sympathy rather with our own German people. If the German people have to sacrifice 160,000 victims in yet another campaign in the east, then those responsible for this bloody conflict will have to pay for it with their lives."[262]
In early 1937, the SS, using prisoner labor, initiated construction of a large complex of buildings on the grounds of the original camp. The construction was officially completed in mid-August 1938 and the camp remained essentially unchanged and in operation until 1945. A crematorium that was next to, but not directly accessible from within the camp, was erected in 1942. KZ Dachau was therefore the longest running concentration camp of the Third Reich. The Dachau complex included other SS facilities beside the concentration camp—a leader school of the economic and civil service, the medical school of the SS, etc. The camp at that time was called a "protective custody camp," and occupied less than half of the area of the entire complex.[13]
The most notorious physician was Josef Mengele, an SS officer who became the Auschwitz camp doctor on 30 May 1943.[54] Interested in genetics[54] and keen to experiment on twins, he would pick out subjects from the new arrivals during "selection" on the ramp, shouting "Zwillinge heraus!" (twins step forward!).[55] They would be measured, killed, and dissected. One of Mengele's assistants said in 1946 that he was told to send organs of interest to the directors of the "Anthropological Institute in Berlin-Dahlem". This is thought to refer to Mengele's academic supervisor, Otmar Freiherr von Verschuer , director from October 1942 of the Kaiser Wilhelm Institute of Anthropology, Human Heredity, and Eugenics in Berlin-Dahlem.[56][55][i] Mengele's experiments included placing subjects in pressure chambers, testing drugs on them, freezing them, attempting to change their eye color by injecting chemicals into children's eyes, and amputations and other surgeries.[59]
The camp was originally designed for holding German and Austrian political prisoners and Jews, but in 1935 it began to be used also for ordinary criminals. Inside the camp there was a sharp division between the two groups of prisoners; those who were there for political reasons and therefore wore a red tag, and the criminals, who wore a green tag.[47] The political prisoners who were there because they disagreed with Nazi Party policies, or with Hitler, naturally did not consider themselves criminals. Dachau was used as the chief camp for Christian (mainly Catholic) clergy who were imprisoned for not conforming with the Nazi Party line.[citation needed]
After the Warsaw Ghetto Uprising, the Ghetto was completely destroyed. Of the more than 56,000 Jews captured, about 7,000 were shot, and the remainder were deported to killing centers or concentration camps. This is a view of the remains of the ghetto, which the German SS dynamited to the ground. The Warsaw Ghetto only existed for a few years, and in that time, some 300,000 Polish Jews lost their lives there. #

The workers who constructed the original buildings were housed in camps near Fallingbostel and Bergen, the latter being the so-called Bergen-Belsen Army Construction Camp.[1] Once the military complex was completed in 1938/39, the workers' camp fell into disuse. However, after the German invasion of Poland in September 1939, the Wehrmacht began using the huts as a prisoner of war (POW) camp.