In 1925 he joined the November Group and from this year onwards till 1932 he participaited annually in the renowned "Große Berliner Kunstausstellung".
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Left-wing artists had already formed groups, such as the November Group, Dadaist groups, or from 1924 to 1926, the Red Group, with which George Grosz, John Heartfield and Rudolf Schlichter were involved.
Called for military service in World War I, he carried out a hunger strike to secure early release, and in 1919 he moved to Berlin where he joined the Communist Party of Germany and the "November" group.