Hitler's entry and rise
After the war, Hitler remained in the army, which was mainly engaged in suppressing socialist uprisings breaking out across Germany, including Munich (Bavarian Soviet Republic), where Hitler returned in 1919. He took part in "national thinking" courses organized by the Education and Propaganda Department (Dept Ib/P) of the Bavarian Reichswehr Group, Headquarters 4 under Captain Mayr. A key purpose of this group was to create a scapegoat for the outbreak of the war and Germany's defeat. The scapegoats were found in "international Jewry," communists and politicians across the party spectrum, especially the parties of the Weimar Coalition, who were deemed "November criminals".

In July 1919, Hitler was appointed a V-Mann (Verbindungsmann is the German term for a police spy) of "Aufklärungskommando" ("Intelligence Commando") of the Reichswehr, for the purpose of influencing other soldiers toward similar ideas and was assigned to infiltrate a small nationalist party, the German Workers' Party (DAP). During his inspection of the party, Hitler was impressed with Drexler's anti-Semitic, nationalist and anti-Marxist ideas. Here Hitler also met Dietrich Eckart, one of the early founders of the party, member of Thule Society.

The German Workers' Party was centred in Munich which had become a hotbed of reactionary German nationalists who included Army officers determined to crush Marxism and undermine or even overthrow the young German democracy centred in Berlin. Gradually they noticed Adolf Hitler and his growing movement as a vehicle to hitch themselves to. Hitler traveled to Berlin to visit nationalist groups during the summer of 1921 and in his absence there was an unexpected revolt among the DAP leadership in Munich.

The Party was run by an executive committee whose original members considered Hitler to be overbearing and even dictatorial. To weaken Hitler's position they formed an alliance with a group of socialists from Augsburg. Hitler rushed back to Munich and countered them by tendering his resignation from the Party on July 11, 1921. When they realized the loss of Hitler would effectively mean the end of the Party, he seized the moment and announced he would return on the condition that he was made chairman and given dictatorial powers. Infuriated committee members (including founder Anton Drexler) held out at first. Meanwhile an anonymous pamphlet appeared entitled Adolf Hitler: Is he a traitor?, attacking Hitler's lust for power and criticizing the violence-prone men around him. Hitler responded to its publication in a Munich newspaper by suing for libel and later won a small settlement.

The executive committee of the DAP eventually backed down and Hitler's demands were put to a vote of party members. Hitler received 543 votes for and only one against. At the next gathering on July 29, 1921, Adolf Hitler was introduced as Führer of the Nazi Party, marking the first time this title was publicly used. Hitler changed the name of the party to the National Socialist German Workers Party (Nationalsozialistische Deutsche Arbeiterpartei or NSDAP).

Hitler's beer hall oratory, attacking Jews, socialists and liberals, capitalists and communists, began attracting adherents. Early followers included Rudolf Hess, the former air force pilot Hermann Göring, and the flamboyant army captain Ernst Röhm, who became head of the Nazis' paramilitary organization, the SA, which protected meetings and attacked political opponents. He also attracted the attention of local business interests, was accepted into influential circles of Munich society and became associated with wartime General Erich Ludendorff during this time.