Question

karl marx is famous for:
being the first communist leader in an actual communist country
killing capitalist leaders
coming up with the idea of communism
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Explanation:

Karl Marx, alongside Friedrich Engels, developed the foundational theories of communism through works like The Communist Manifesto. He never led a communist country (the first such leader was Vladimir Lenin for Soviet Russia) and did not engage in killing capitalist leaders.

Answer:

Coming up with the idea of communism