Blutmai 1929 and the Split Left
In May 1929 Berlin's Social Democratic police chief Karl Zörgiebel banned May Day demonstrations. When Communist workers marched anyway, police fired into crowds in Wedding and Neukölln and killed dozens of people, among them the fictional working mother Gudrun Braun. The massacre hardened Communist hatred of the Social Democrats as 'social fascists' and fractured the left, which could otherwise have stood jointly against the Nazis.
