"In The Road to Serfdom (1944), the Austrian School economist Friedrich Hayek wrote that the dictatorship of the proletariat likely would destroy personal freedom as completely as does an autocracy. The European Commission of Human Rights found pursuing the dictatorship of the proletariat incompatible with the European Convention on Human Rights in Communist Party of Germany v. the Federal Republic of Germany (1957)."
Of course, Marxism is just one version of communism among several.
[0] https://en.wikipedia.org/wiki/Dictatorship_of_the_proletaria...
The dictatorship of the proletariat is contrasted to the current dictatorship of the bourgeoisie. It just means that workers are collectively the ruling class in socialist countries, as opposed to owners (of capital) in capitalist countries.
What? Since when and in what way?
The common definition of Communism is where all participants are sharing the ownership of production and trying to remove things like money and financial class. Many ideas in Communism in fact assumes the absence of any kind of central government.
Then that the states that have tried "Communism" in modern haven't actually aimed for any of the original goals is less important. But let's not change meaning of words willy nilly like you did here.