The Republic of Cuba page on Prolewiki is a pretty good starter. Usually people that claim such and such state is only adopting Marxism aesthetically to “fool” the population just fundamentally misunderstand how ideology works and how cultural hegemony works. For that, I recommend the essay Masses, Elites, and Rebels: The Theory of “Brainwashing.”
In addition to what @sharkfucker420@lemmy.ml said, statelessness in the context of communism refers to one that has collectivized production and distribution, and in so doing has eliminated class society. Administration remains, but oppressive tools like police fade away as there no longer is a basis for class struggle. The origin of the state, after all, is class society and a need for a ruling class to win class struggles.