That’s not exactly “communists”

nazism is inherently evil because their ideology has racial supremacy as one of its core tenets

communism, is a statesless, classless, egalitarian society.

But what went wrong in USSR and PRC is the Vanguardism. Vangardism is the belief that a “Vanguard Party” will establish a state with the vanguard party having full control over the country, then when communism is acheived, the state would “wither away”. I mean guess how that works out (it failed). When people have dictatorial powers, they will never give it up. That was the problem with USSR and PRC, not the “communism”. (They never really had communism. Russia and modern day China are State-Capitalists)