All communist countries i know of went into authoritarianism along the way. There's this weird idea that communism can be implemented through creating an authoritarian state that then abolishes itself, turns out the people in power generally don't want to give it up, who would've thought.
Fwiw I disagree with a lot of assumptions in marxism and some of the conclusions and am overall more of a social capitalist but it's pretty true that there hasn't been a truly communist country yet. But I'm fairly sure the same could be said of true pure capitalism anyway.