In the revolutionary turmoil of 1918/1919 the USPD in its turn broke apart, with a majority of members drawing inspiration from Russia's at this stage widely celebrated October Revolution and joining Germany's own recently launched Communist Party. In 1920 Erich Raddatz switched his own party allegiance, serving as a Communist member of the for Neukölln between 1920 and 1925. He continued to sit on the Neukölln council between 1926 and 1930, but now in an unpaid capacity. Between 1928 and 1932 he also served as a member of the which under the terms of the 1920 was a municipal executive body with (limited) powers and responsibilities covering the entire city.