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[[File: Bundesarchiv_Bild_183-Z0127-305,_Berlin_1927,_Reichstreffen_RFB,_Thälmann,_Leow.jpg|thumbnail|300px|left|Communist Party leader Ernst Talmann marching in Berlin in 1927]]

Despite the Revolution in 1918, many on the left believed that it did not go far enough. The radical left wanted a communist system in Germany. Revolutionaries established the Communist Republic in Bavaria and later seized control of the Ruhr. These were both defeated by the German army and right wing-militias the Freirkorps. In 1919, Communists, led by Rosa Luxembourg, tried to stage a revolution in Berlin. The army also defeated this with great brutality. It was not only the left that was a threat to the Weimar Republic.