I don't know. Trotsky and Zinoviev were pretty god damn important, but Stalin had them killed all the same. Post-1936, Stalin's inner circle wasn't very Jewish at all.

Besides, at the very most Vladimir Lenin "supposedly" had some Jewish ancestry through his maternal grandfather (whom apparently converted to Christianity, if that is true). But if he did have it, he didn't care much about it, and the Bolshevik party was his party.