It's never worked because it can't work: against human nature, nature in general, at its most fundamental level. It's (socialism) an ideology (faith) of the weak, which is really one of the very few substantive differences it has with fascism, national socialism.
Fascism is muscular.
So how do you defeat someone who is stronger than you? You make them weak. You wittle them down from within. Communism (international socialism) could only ever "work," when everyone bought in, when everyone was brainwashed into their ideology (faith): when everyone was made weak. It's a religious conversion, as Marx admitted it be a new faith, a new man. Who enjoys the fruits of this new religion, who are the new priest class? It's Mamdani, those idiot losers holding their psyop candle lit vigil last night.