My brother your understanding of that Karl Marx theory is very narrow. That Karl Marx theory can only work in a small society of few people and not much. Which that can under themselves. Even a Nations State with large number of people can't unite themselves.
And a society can never be equal again on this Earth because the mindset of the people is no more one again. Capitalism has spoiled everything for Marxist theory. Do you also remember that Marx said the only way for the people to have egalitarian society is massive revolution against the Capitalist society but the Capitalist use these the same youths to divide themselves, so there will be no unity in anywhere. The rich is using the poor to divide themselves.