"a political philosophy, movement, or regime (such as that of the Fascisti) that exalts nation and often race above the individual" - Despite making internationalist noises, the USSR was imperialist toward the outside world, and oppressive toward internal minorities.
"stands for a centralized autocratic government headed by a dictatorial leader" - Lenin, Stalin, Khrushchev, Brezhnev, ...
"severe economic and social regimentation" - Collective and state farms, nationalized industries, Oktobrianiks & Komsomols.
"forcible suppression of opposition" - Lenin's & Stalin's purges, suppression of dissidents.