Do you mean the german ones thrown in the camps or the soviet leadership who were the last of the eventual allied powers to do any sort of appeasement with Hitler (after exhausting all attempts to form an alliance with Britain and France) because communism is less aligned with fascist goals than liberalism is aligned with fascist goals, massive underexageration mine? Do you mean the communist low level officials who helped in a massive ethnic relocation program to move vulnerable minorities out of the way of the eventual german invasion? Or do you mean the population of the only communist nation which lost 26 million people, around 1/6th of their population, stopping the holocaust?
Or were you referring to the joke about racism? If so, you gotta look up how the population of the USSR was not considered white at the time. Emma Goldman for example basically called Stalin a slanty eyed conniving Asian, for example. Nowadays slavs are still called orcs and shit by westerners.