E. Rosenhaft, “Working-Class Life and Working-Class Politics: Communists, Nazis and the State in the Battle for the Streets, Berlin, 1928-1932”, in R. Bessel and E. Feuchtwanger (eds.), Social Change and Political Development in Weimar Germany (London, 1981); E. Rosenhaft, Beating the Fascists? The German Communists and Political Violence (Cambridge, 1983).