I mean, you only really have to imagine Stalin and add an extra amount of racial hate and scapegoating - “capitalist Jews” is a classic far right idea that’s easy to transfer to far-left ideologies. The USSR was already pretty nationalist and imperialist anyway and strongly promoted Russian language and culture in the areas it conquered, and opposed religion. Bad time to be Jewish, especially after WW2, though the official goal was assimilation rather than extermination.