Sorry to spam you with nitpicks, but I do feel obliged to say that while Einstein was certainly a socialist and spoke very well of Lenin and even Stalin, I don’t think we have evidence of him having a specific and cultivated political ideology that fit a label like “Marxism.” I think he was more of a generic humanist who appreciated what his Marxist contemporaries were doing.
Incidentally, how did Marx borrow from Proudhon? I fully only know of Proudhon through Discourse about concerning material he wrote and that quote about, ironically, wishing for a future where he would be executed as a conservative.
Oh sure, Owen was mistaken from the outset because his genuinely more-efficient way of running things isn’t going to be as profitable to the owning class, meaning that no amount of advocacy can escape the gravitational pull of the profit motive dragging it down into the mire of human misery. I was just talking about what he did that ruined his career from a practical standpoint by drawing the ire of the bourgeoisie, which was not his company town model alone.