"Between the misdeeds of Hitler and those of Stalin, in my opinion, there exists only a quantitative difference... I don't know if the Communist idea, if its theory, already contained a basic fault or if only the Soviet practice under Stalin betrayed the original idea and established in the Soviet Union a kind of Fascism."
https://en.wikiquote.org/wiki/Fascism's_relationship_with_other_political_and_economic_ideologies