The Communist Workers' Party of Germany was an anti-parliamentarian and left communist party that was active in Germany during the Weimar Republic. It was founded in 1920 in Heidelberg as a split from the Communist Party of Germany (KPD). Originally the party remained a sympathising member of Communist International. In 1922, the KAPD split into two factions, both of whom kept the name, but are referred to as the KAPD Essen Faction and the KAPD Berlin Faction.

Paul Levi was a German communist and social democratic political leader. He was the head of the Communist Party of Germany following the assassination of Rosa Luxemburg and Karl Liebknecht in 1919. After being expelled for publicly criticising Communist Party tactics during the March Action, he formed the Communist Working Organisation which in 1922 merged with the Independent Social Democratic Party. This party, in turn, merged with the Social Democratic Party a few months later and Levi became one of the leaders of its left wing.