In October 1941, work began on Auschwitz II, or Birkenau, located outside the nearby village of Brzezinka. There the SS later developed a huge concentration camp and extermination complex that included some 300 prison barracks; four large so-called Badeanstalten (German: “bathhouses”), in which prisoners were gassed to death; Leichenkeller (“corpse cellars”), in which their bodies were stored; and Einäscherungsöfen (“cremating ovens”). Another camp (Buna-Monowitz), near the village of Dwory, later called Auschwitz III, became in May 1942 a slave-labour camp supplying workers for the nearby chemical and synthetic-rubber works of IG Farben. In addition, Auschwitz became the nexus of a complex of 45 smaller subcamps in the region, most of which housed slave labourers. During most of the period from 1940 to 1945, the commandant of the central Auschwitz camps was SS-Hauptsturmführer (Capt.) and ultimately SS-Obersturmbannführer (Lieut. Col.) Rudolf Franz Hoess (Höss).
When the Italian invasion of Ethiopia led to only mild protests by the British and French governments, on 7 March 1936 Hitler used the Franco-Soviet Treaty of Mutual Assistance as a pretext to order the army to march 3,000 troops into the demilitarised zone in the Rhineland in violation of the Versailles Treaty. As the territory was part of Germany, the British and French governments did not feel that attempting to enforce the treaty was worth the risk of war. In the one-party election held on 29 March, the NSDAP received 98.9 percent support. In 1936, Hitler signed an Anti-Comintern Pact with Japan and a non-aggression agreement with Mussolini, who was soon referring to a "Rome-Berlin Axis".
Of the Jews sent to Bergen-Belsen, very few were set free. One group of 222 Jews reached Palestine after leaving Bergen-Belsen on 10 July 1944. The second group left the camp in two parts – in August and December 1945, the Kasztner transport was sent to Switzerland. Finally, on 25 January 1945, 136 Jews with South American passports reached Switzerland.
POW camps (Kriegsgefangenen-Mannschafts-Stammlager / Stalag) a.k.a. Main Camps for Enlisted Prisoners of War: concentration camps where enlisted prisoners-of-war were held after capture. The inmates were usually assigned soon to nearby labor camps, (Arbeitskommandos), i.e. the Work Details. POW officers had their own camps (Offizierslager' / Oflag). Stalags were for Army prisoners, but specialized camps (Marinelager / Marlag ("Navy camps") and Marineinterniertenlager / Milag ("Merchant Marine Internment Camps")) existed for the other services. Kriegsgefangenen-Mannschafts-Stammlager Luftwaffe / Stalag Luft ("Air Forces Camps") were the only camps that detained both officers and non-commissioned personnel together.
Hitler primarily viewed the German economy as an instrument of power and believed the economy was not about creating wealth and technical progress so as to improve the quality of life for a nation's citizenry, but rather that economic success was paramount for providing the means and material foundations necessary for military conquest. While economic progress generated by National Socialist programs had its role in appeasing the German people, the Nazis and Hitler in particular did not believe that economic solutions alone were sufficient to thrust Germany onto the stage as a world power. The Nazis thus sought to secure a general economic revival accompanied by massive military spending for rearmament, especially later through the implementation of the Four Year Plan, which consolidated their rule and firmly secured a command relationship between the German arms industry and the National Socialist government. Between 1933 and 1939, military expenditures were upwards of 82 billion Reichsmarks and represented 23 percent of Germany's gross national product as the Nazis mobilised their people and economy for war.
^ In his testimony, according to Polish historian Aleksander Lasik, "Höss neither protected anyone nor evaded his own responsibility. His stance came as a surprise to many, especially those who viewed him as a bloodthirsty beast. Instead, he viewed his crimes in terms of the technical obstacles and challenges with which he had to cope. Höss stated that he led the killings in Auschwitz on express orders of Reichsführer Himmler."
A separate camp for the Roma, the Zigeunerfamilienlager ("Gypsy family camp"), was set up in the BIIe sector of Auschwitz II-Birkenau in February 1943. For unknown reasons, they were not subject to selection and families were allowed to stay together. The first transport of German Roma arrived at Auschwitz II on 26 February that year. There had been a small number of Romani inmates before that; two Czech Romani prisoners, Ignatz and Frank Denhel, tried to escape in December 1942, the latter successfully, and a Polish Romani woman, Stefania Ciuron, arrived on 12 February 1943 and escaped in April.
When the Nazis came to power in Germany, they quickly moved to suppress all real and potential opposition. The general public was intimidated by the arbitrary psychological terror that was used by the special courts (Sondergerichte). Especially during the first years of their existence when these courts "had a strong deterrent effect" against any form of political protest.