SS formations committed many war crimes against civilians and allied servicemen.[238] From 1935 onward, the SS spearheaded the persecution of Jews, who were rounded up into ghettos and concentration camps.[239] With the outbreak of World War II, the SS Einsatzgruppen units followed the army into Poland and the Soviet Union, where from 1941 to 1945 they killed more than two million people, including 1.3 million Jews.[240] A third of the Einsatzgruppen members were recruited from Waffen-SS personnel.[241][242] The SS-Totenkopfverbände (death's head units) ran the concentration camps and extermination camps, where millions more were killed.[243][244] Up to 60,000 Waffen-SS men served in the camps.[245]
Thomas Keneally tells in his famous book Schindler's Ark how the women were marched naked to a quartermaster's hut where they were handed the clothes of the dead. Half dead themselves, dressed in rags, they were packed tight into the darkness of freight cars. But the Schindler-women with their heads cropped, many too ill, too hollowed out, to be easily recognised - the Schindler-women giggled like schoolgirls. One of the women, Clara Sternberg, heard an SS guard ask a colleague: 'What's Schindler going to do with all the old women?' 'It's no one's business,' the colleague said. 'Let him open an old people's home if he wants.'

During June and July 1933, all competing parties were either outlawed or dissolved themselves and subsequently the Law against the founding of new parties of 14 July 1933 legally established the Nazi Party's monopoly. On 1 December 1933, the Law to secure the unity of party and state entered into force, which was the base for a progressive intertwining of party structures and state apparatus.[82] By this law, the SA—actually a party division—was given quasi-governmental authority and their leader was co-opted as an ex officio cabinet member. By virtue of a 30 January 1934 Law concerning the reorganisation of the Reich, the Länder (states) lost their statehood and were demoted to administrative divisions of the Reich's government (Gleichschaltung). Effectively, they lost most of their power to the Gaue that were originally just regional divisions of the party, but took over most competencies of the state administration in their respective sectors.[83]
Drexler's movement received attention and support from some influential figures. Supporter Dietrich Eckart, a well-to-do journalist, brought military figure Felix Graf von Bothmer, a prominent supporter of the concept of "national socialism", to address the movement.[27] Later in 1918, Karl Harrer (a journalist and member of the Thule Society) convinced Drexler and several others to form the Politischer Arbeiterzirkel (Political Workers' Circle).[23] The members met periodically for discussions with themes of nationalism and racism directed against the Jews.[23] In December 1918, Drexler decided that a new political party should be formed, based on the political principles that he endorsed, by combining his branch of the Workers' Committee for a good Peace with the Political Workers' Circle.[23][28]
The most infamous doctor at Auschwitz was Josef Mengele, the "Angel of Death", who worked in Auschwitz II from 30 May 1943, at first in the gypsy family camp.[127] Particularly interested in performing research on identical twins, dwarfs, and those with hereditary disease, Mengele set up a kindergarten in barracks 29 and 31 for children he was experimenting on, and for all Romani children under six, where they were given better food rations.[128] From May 1944, he would select twins and dwarfs during selection on the Judenrampe,[129] reportedly calling for twins with "Zwillinge heraus!" ("twins step forward!").[130] He and other doctors (the latter prisoners) would measure the twins' body parts, photograph them, and subject them to dental, sight and hearing tests, x-rays, blood tests, surgery, and blood transfusions between them.[131] Then he would have them killed and dissected.[129] Kurt Heissmeyer, another German doctor and SS officer, took 20 Jewish children from Auschwitz to use in pseudoscientific medical experiments at the Neuengamme concentration camp.[132] In April 1945, the children were killed by hanging to conceal the project.[133]

Nazism, also spelled Naziism, in full National Socialism, German Nationalsozialismus, totalitarian movement led by Adolf Hitler as head of the Nazi Party in Germany. In its intense nationalism, mass appeal, and dictatorial rule, Nazism shared many elements with Italian fascism. However, Nazism was far more extreme both in its ideas and in its practice. In almost every respect it was an anti-intellectual and atheoretical movement, emphasizing the will of the charismatic dictator as the sole source of inspiration of a people and a nation, as well as a vision of annihilation of all enemies of the Aryan Volk as the one and only goal of Nazi policy.

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).[11] Especially during the first years of their existence when these courts "had a strong deterrent effect" against any form of political protest.[12]