I've recently studied Stalin's actions in detail. Upto and including the time for which the second world war ran, Stalin was not an anti-semite, he was a mass murderer, but he killed indiscrimanately, he wasn't particularly targetting Jews at all. It was not until the foundation of Israel as a free Jewish nation that Stalin became an anti-semite, as he presumed that all Jews supported Israel, and Israel signed an alliance with the USA, with which he was enemies.