For starters, the Moscow-controlled Communist International, and its sidekick, the Communist Party of Germany, made Hitler’s rise to power possible, if not indeed inevitable, by tarring the German Social Democrats as “social fascists” who threatened to split the proletariat and were, thus, a greater evil than the Nazis. Had the German left remained united against the real threat—Nazism—Hitler might not have come to power. (Many leftists make a similar mistake today, preferring Vladimir Putin’s fascism to American capitalism and thereby promoting war in Europe.)

Source: Soviet-Nazi Collaboration and World War II | World Affairs Journal – April 30, 2015.