Not really, no. The USSR has its own history of genocides, especially against muslim communities. And both USSR and the nazis were strongly opposed to any form of social protests: the nazis called opponents "terrorists" or "judeo-bolshevik", while the USSR called them "leftists" or "counter-revolutionaries" (see also: Cronstadt uprising, Makhnovtchina).

Let's not forget also that Hitler and Staline had an alliance at some point. There are quite a few differences between national socialism (nazism) and authoritarian communism, but they can't exactly be presented as opposites, as they occupy the same half (authoritarianism) of the political compass.

Disclaimer: i'm advocating for libertarian communism (self-organization, not bureaucracy). I believe defending tyrannical regimes in the name of communism does not help the cause. In fact, i would even argue the USSR killed all chances of communism when the Bolsheviks started slaughtering the real revolutionaries (anarchists and anti-authoritarian marxists alike), and that they never tried to go beyond the dictatorship of the proletariat which was presented as exceptional/temporary measures against counter-revolutionary activities on the road to communism (stateless, classless society). Having a central State dictating your life and bureaucrats overseeing your work is not communism: it's State capitalism (or as Mussolini called it referring to fascism: corporatism) at its finest.