Stalin was many things, but not anti-Semite. He just hated everyone and killed everyone — an equal opportunities killer.
From what I’ve read he might have been anti-Semitic. “The Doctors Plot” was a campaign generated by Stalin in the early ‘50s to get rid of prominent Jews who were supposedly conspiring to murder Soviet leaders...like Dear Uncle Joe. Fortunately, Stalin croaked before a lot of innocent people could be imprisoned and/or murdered. One week after he died, the campaign was dropped by the authorities.