Weimar Communism as Mass Movement, 1918-1933
Edited by Ralf Hoffrogge and Norman Laporte
(Lawrence and Wishart, £20)

IF THE KPD — the largest communist party outside Soviet Russia — and the German Social Democratic Party (SPD) had united to fight Hitler, then history would have turned out very differently and millions of lives would have been saved. Debate has raged over who was to blame for this historical catastrophe, in which Germany’s two largest working-class parties fought each other rather than the fuehrer.

Stalin alone has usually been blamed for this calamity by the professional Kremlinologists but now that KPD archives and Comintern documents are freely available to researchers, it's possible to examine the background to this historical era and distinguish speculation from the facts.