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Sartre and Marxism

I’ve heard people say that Sartre was a Marxist and I’ve heard others say that his philosophical ideas were non-Marxist and that he was merely sympathetic towards Marxism.
Could someone explain what his relationship to Marxism was exactly and what the contradictions are?
gpt
Sartre believed that Marxism and existentialism were fundamentally compatible, with his later essay *Search for a Method* and *Critique of Dialectical Reason* written to that end. Sartre viewed himself as a Marxist and was a vocal defender of the Soviet Union, even after news of Stalin's state violence. Orthodox Marxists, though, would probably repudiate his existentialist Marxism.