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Could you clarify what you mean when you say you are 'not looking for historical content'?
If it's not an historical example, won't it necessarily be speculative?
Marxists aren't utopian. To paraphrase, communism is the real movement of the abolition of the current state of the world. Marxists obviously have an idea of what might come next. But Marx and Engels didn't really flesh that out. It's impossible to predict the specifics. It's hard to even imagine what socialism will look like.
All we can really say is that socialism will come out of and resolve the contradictions of capitalism. Communism will come out of and resolve the contradictions of socialism.
That said, all history is the history of class struggle. Socialism involves a dictatorship of the proletariat. The class that is currently exploited will become the ruling class. There will still be exploitation for a while. Perhaps for a long while. But the intention will be to create the conditions to end exploitation. Socialism, and thus communism, will be whatever the working class wants it to be, collectively.
Examples from the USSR, China, Cuba, the DPRK, Laos, Vietnam, and depending on the definition, Ghana, Chile under Allende, and a host of other states will show you what communists try to achieve when they get into power. They struggle because they get attacked (literally invaded, carpet bombed, sanctioned, and/or couped). Due to that, the legacy of the previous system, and material limits to what's possible, actual examples (AES) are all flawed. Still, they tend to manage to: abolish illiteracy, massively increase industrial output, and abolish homelessness. They build roads, hospitals, schools, houses. And they keep going until they are defeated, which ranges from a few months to several decades to not yet.
