From 1942, the SS reorganised the concentration camp administration to mobilise the millions of prisoners within the camps. The Nazis established hundreds of sub-camps across Europe. The Auschwitz camp complex contained over 40 sub-camps that housed thousands of Jewish prisoners to work as forced labour in the coalmines, various munitions factories and the I.G. Farben synthetic rubber plant at Buna Monovitz.
It was founded as the German Workers’ Party by Anton Drexler, a Munich locksmith, in 1919. Hitler attended one of its meetings that year, and before long his energy and oratorical skills would enable him to take over the party, which was renamed National Socialist German Workers’ Party in 1920. That year Hitler also formulated a 25-point program that became the permanent basis for the party. The program called for German abandonment of the Treaty of Versailles and for the expansion of German territory. These appeals for national aggrandizement were accompanied by a strident anti-Semitic rhetoric. The party’s socialist orientation was basically a demagogic gambit designed to attract support from the working class. By 1921 Hitler had ousted the party’s other leaders and taken over.
Estimates of the total German war dead range from 5.5 to 6.9 million persons. A study by German historian Rüdiger Overmans puts the number of German military dead and missing at 5.3 million, including 900,000 men conscripted from outside of Germany's 1937 borders. Richard Overy estimated in 2014 that about 353,000 civilians were killed in Allied air raids. Other civilian deaths include 300,000 Germans (including Jews) who were victims of Nazi political, racial, and religious persecution and 200,000 who were murdered in the Nazi euthanasia program. Political courts called Sondergerichte sentenced some 12,000 members of the German resistance to death, and civil courts sentenced an additional 40,000 Germans. Mass rapes of German women also took place.
Auschwitz II (or "Birkenau") was completed in early 1942. Birkenau was built approximately 1.9 miles (3 km) away from Auschwitz I and was the real killing center of the Auschwitz death camp. It was in Birkenau where the dreaded selections were carried out on the ramp and where the sophisticated and camouflaged gas chambers laid in waiting. Birkenau, much larger than Auschwitz I, housed the most prisoners and included areas for women and Gypsies.
The first camp in Germany, Dachau, was founded in March 1933. The press announcement said that "the first concentration camp is to be opened in Dachau with an accommodation for 5,000 people. All Communists and – where necessary – Reichsbanner and Social Democratic functionaries who endanger state security are to be concentrated there, as in the long run it is not possible to keep individual functionaries in the state prisons without overburdening these prisons." Dachau was the first regular concentration camp established by the German coalition government of National Socialist Workers' Party (Nazi Party) and the Nationalist People's Party (dissolved on 6 July 1933). Heinrich Himmler, then Chief of Police of Munich, officially described the camp as "the first concentration camp for political prisoners."