I don't know anything in Marxist analysis of society as classes in conflict with each other that is in contradiction with free speech, much to the contrary. It might be interesting to read the ideology you are talking about instead of using fifth hand evidence and talking in idées reçues. In any case I don't know of literally any country in the world that implemented the Marxist idea of libertarian government free of any distinction between ruler and ruled, and I don't quite know how one can argue that Marxism, an ideology that is against the state, and that claims as its mos vital immediate goal to set up direct democracy and small government from politics to economics (indeed, this comes from the Marxist notion of the State that is still the best definition and that stands on my sociology textbook, unsurprisingly as Marx was one of the founders of social science, recognize that the State is defined by the use of violence in the context of a hierarchical class based society, meaning that abolishing the state entirely has as a necessary prerequisite, according to Marx, the abolition of economic classes and such the ownership and control of production by labour) is somehow a proponent of censorship.
