There has been some debate about exactly what Marx intended by this phrase but regardless his intentions, in my view it was always doomed to be abused in this way. This was pointed out forcefully by Bakunin and other contemporaries of Marx in the socialist movement, and it came to pass exactly as they predicted. Who decides what constitutes “bourgeois interest” or “false consciousness”? The party of course, and who controls the party? The party leadership, or in other words, Lenin, Stalin, or whoever else manages to connive their way onto the throne. This is far from a proletarian democracy, and if that’s what Marx wanted, he ought to have chosen his words far more carefully.

This also dovetails with another key flaw in Marxism which is its class reductionism. Political leaders can and do have distinct interests from the proletariat, even when they may have once belonged to that class. We see this tension clearly in every supposed proletarian government in history, and many others besides. So in addition to the problems of top-down hierarchy, the decision to have Bolshevik leaders be full-time revolutionaries was also a large contributor to their alienation from the people whose interests they claimed to pursue, and the horrific violence they soon inflicted in on them.