He made contact with Paul Levi and worked in his newspaper Unser Weg (Our Way) and in 1923 rejoined the SPD.
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After 1921, when the KAPD still had over 43,000 members, the party's influence declined more and more, and it separated in 1922 into the Berliner Faction and the Essen Faction around Alexander Schwab, Arthur Goldstein, Bernhard Reichenbach and Karl Schröder.