Deer Smeller, thanks. Not only that, however, but National Socialism (i.e, Nazism) was, well, national, while International Communism was international. That is to say, Hitler wanted the "benefits" of socialism exclusively for Germanac peoples, while all other peoples would be reduced to the status of slaves in the service of the "superior" Germanic races. Stalin, though the worst kind of monster, didn't much care what race you were. He wouldn't think twice about murdering you, but he didn't care about your race.