Adolf Hitler, the party's leader since 1921, was appointed Chancellor of Germany by President Paul von Hindenburg on 30 January 1933. Hitler rapidly established a totalitarian regime[12][13][14][15] known as the Third Reich. Following the defeat of the Third Reich at the conclusion of World War II in Europe, the party was "declared to be illegal" by the Allied powers,[16] who carried out denazification in the years after the war.
Despite such tactical breaks necessitated by pragmatic concerns, which were typical for Hitler during his rise to power and in the early years of his regime, Hitler never ceased being a revolutionary dedicated to the radical transformation of Germany, especially when it concerned racial matters. In his monograph, Hitler: Study of a Revolutionary?, Martyn Housden concludes:
The history of Auschwitz-Birkenau as an extermination center is complex. From late 1941 to October 1942, the mortuary at Auschwitz main camp, which was already equipped with a crematorium, was adapted as a gas chamber. It measured approximately 835 square feet. In the spring of 1942, two provisional gas chambers at Birkenau were constructed out of peasant huts, known as the 'bunkers'.
Before he joined the Bavarian Army to fight in World War I, Hitler had lived a bohemian lifestyle as a petty street watercolour artist in Vienna and Munich and he maintained elements of this lifestyle later on, going to bed very late and rising in the afternoon, even after he became Chancellor and then Führer.[47] After the war, his battalion was absorbed by the Bavarian Soviet Republic from 1918 to 1919, where he was elected Deputy Battalion Representative. According to historian Thomas Weber, Hitler attended the funeral of communist Kurt Eisner (a German Jew), wearing a black mourning armband on one arm and a red communist armband on the other,[48] which he took as evidence that Hitler's political beliefs had not yet solidified.[48] In Mein Kampf, Hitler never mentioned any service with the Bavarian Soviet Republic and he stated that he became an antisemite in 1913 during his years in Vienna. This statement has been disputed by the contention that he was not an antisemite at that time,[49] even though it is well established that he read many antisemitic tracts and journals during time and admired Karl Lueger, the antisemitic mayor of Vienna.[50] Hitler altered his political views in response to the signing of the Treaty of Versailles in June 1919 and it was then that he became an antisemitic, German nationalist.[49]
According to Hankes there has been a national shift among white supremacist and neo-Nazi groups. "It wasn't that long ago that we were having conversations about whether the movement was going to age out. You would go to conferences and it would be an audience full of white men in their late 30s and up. Now, you go to the same conferences and they're sold out and the average age has dropped by 20 years," Hankes explained.
Another reactionary aspect of Nazism was in their arts policy, which stemmed from Hitler's rejection of all forms of "degenerate" modern art, music and architecture.[286] Overall, however, Nazism – being the ideology and practices of the Nazi Party, and the Nazi Party being the manifestation of Hitler's will[287] – is best seen as essentially revolutionary in nature.

In 1976, Otto Frank took action against Heinz Roth of Frankfurt, who published pamphlets stating that the diary was "a forgery". The judge ruled that if Roth was to publish any further statements he would be subjected to a fine of 500,000 German marks and a six-month jail sentence. Roth appealed against the court's decision. He died in 1978, and after a year his appeal was rejected.[94]
Nazi Germany maintained concentration camps (German: Konzentrationslager, KZ or KL) throughout the territories it controlled before and during the Second World War. The first Nazi camps were erected in Germany in March 1933 immediately after Hitler became Chancellor and his Nazi Party was given control of the police by Reich Interior Minister Wilhelm Frick and Prussian Acting Interior Minister Hermann Göring.[2] Used to hold and torture political opponents and union organizers, the camps initially held around 45,000 prisoners.[3] In 1933–1939, before the onset of war, most prisoners consisted of German Communists, Socialists, Social Democrats, Roma, Jehovah's Witnesses, homosexuals, and persons accused of 'asocial' or socially 'deviant' behavior by the Germans.[4]