What did the different expressions of global communism in the twentieth century share in common?

Question

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The different expressions of global communism in the twentieth century all shared a common ideology derived from European Marxism, although they varied in their implementation and practice. They all claimed to be working towards a stateless society without private property, but some were more focused on militancy and violence than others. None of them emphasized isolationism or aimed for reform through peaceful and democratic means.

What Did the Different Expressions of Global Communism in the Twentieth