Marxism opposes it in theory, not practice. Soviets had nomenklatura - senior party members and officials who controlled key positions in government, industry, the military, and media. They didn't "own" factories but they controlled them.

This place is so overwhelmingly biased that it will most likely refuse to acknowledge this and maintain their simplistic black-and-white views. Marxists simply abolished the term "aristocracy" in a formal sense while continuing such practices.