Later in the 1970s, Nolte was to reject aspects of the theory of generic fascism that he had championed in "The Three Faces of Fascism" and instead moved closer to embracing totalitarian theory as a way of explaining both Nazi Germany and the Soviet Union. In Nolte's opinion, Nazi Germany was a "mirror image" of the Soviet Union and, with the exception of the "technical detail" of mass gassing, everything the Nazis did in Germany had already been done by the communists in Russia.