I mean, it wasn't, at least not according to the actual people who ran those governments. The USSR and the CCP were/are revolutionary governments, real communism happens when/if the revolutionary governments succeeds and transitions the means of control back to the proletariat.
and ur grandparents probably deserved it.
Really working hard to build those bridges of mutual respect and cooperation I see. This is one of the key reasons the USSR imploded in the first place.
The expansion of Soviet influence happened under the influence of Russian chauvinism, a major contradiction with the more successful maoist ideology today. Instead of allowing communism to be shaped by individual ethnicities or nations they did their best to russify or simply purge the base of power in the country, bolshevists or not.
Stalin and Beria did a whole bunch of purging of leftist to secure their control over the party. If you actually think everyone the Soviets killed deserved it, please go read about the Makhnovist, the Mensheviks, the Georgian bolshevist, hell go read what the Soviets did to the original leftist leader in North Korea.
difference is under capitalism it is constant under socialism it is rare.
Unfortunately that's just not true. Revolutions are highly hierarchical due to their inherent need to react to militant reactionaries. As they begin to solidify their revolution and take over the responsibilities of the state, this hierarchy gets transferred from the the state.
Authoritarian governments are highly efficient, but are extremely hard to get away from once established. Often times the militant leader of the revolution is not the guy you want to be in complete control of the state after establishing a revolutionary government.
Mao was decent enough to accept this after the failure of the cultural revolution, Stalin on the other hand......