Blutmai
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Blutmai was an outbreak of political violence that occurred in Berlin from 1 to 3 May 1929.
Berlin Police dismantle a barricade erected by communists
Headline of Der Abend ('The Evening'), late edition of the SPD's Vorwärts, on 29 April 929: "200 Dead on May 1? The Criminal Plans of the Communists"
Street barricade erected during the violence
Berlin Police in the streets of Neukölln
Social fascism
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Social fascism was a theory developed by the Communist International (Comintern) in the early 1930s which saw social democracy as a moderate variant of fascism.
Leon Trotsky