Under the leadership of Adolf Hitler (1889-1945), the National Socialist German Workers’ Party, or Nazi Party, grew into a mass movement and ruled Germany through totalitarian means from 1933 to 1945. Founded in 1919 as the German Workers’ Party, the group promoted German pride and anti-Semitism, and expressed dissatisfaction with the terms of the Treaty of Versailles, the 1919 peace settlement that ended World War I (1914-1918) and required Germany to make numerous concessions and reparations. Hitler joined the party the year it was founded and became its leader in 1921. In 1933, he became chancellor of Germany and his Nazi government soon assumed dictatorial powers. After Germany’s defeat in World War II (1939-45), the Nazi Party was outlawed and many of its top officials were convicted of war crimes related to the murder of some 6 million European Jews during the Nazis’ reign.
Arthur Moeller van den Bruck was initially the dominant figure of the Conservative Revolutionaries influenced Nazism. He rejected reactionary conservatism while proposing a new state that he coined the "Third Reich", which would unite all classes under authoritarian rule. Van den Bruck advocated a combination of the nationalism of the right and the socialism of the left.
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. Used to hold and torture political opponents and union organizers, the camps initially held around 45,000 prisoners. 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.