Some of the similarities and parallels include: Frequent recognition by Hitler and various Nazi leaders (and also Mussolini) that their only revolutionary and ideological counterparts were to be found in the Soviet Union... [and the] espousal of the have-not, proletarian-nation theory, which Lenin adopted only after it had been introduce in Italy... Hitlerian National Socialism more nearly paralleled Russian communism than has any other non-Communist system.