Labor disciplines itself when set to some task. If you don't do the job assigned to you, if you don't pull your weight, you won't work at some place. The other workers do not want you there.
All of this was premised on the idea that workers know how to work and didn't need to be told. That is the most basic rule. The workers in charge means exactly that; that there is a body among the workers that handles disciplinary action.
The moment you introduce some technocratic management from outside, where the incentives are not the workers' own, you've already detracted from the task of labor itself. This is how you shit up a workplace, create intrigues, and get the slaves to attack each other. It's always for that purpose. It is premised on the belief that workers are evil and stupid and will just destroy everything if they're not managed by a boss that is detached from labor and sees labor as a purely desultory and miserable act.
Sadly, the mangers were proven true, and this happened mostly because the workers really were evil, because they were taught that evil is stronger than any goodness in the world. If workers do not want society, then what exactly are they doing among society? The genuine aim of the laboring classes is to be free of overbearing management, and they will work towards that aim. Once established, they turned viciously against other workers and the lowest class, having established security for themselves and their buddies. There is no law of labor itself or "law of nature" that required this to happen. That is how history for humans turned out, for reasons humans understood well but that "the theory" insisted wasn't happening as it was happening.
If however the question assumes that workers do this purely out of incompetence rather than malice, that is a faulty assumption. Anyone who works learns by heart what is necessary for whatever work task they are set to. If they do not know this, they will have to learn, or they will surely sink. The malice of labor against other laborers was already established in humanity since time immemorial. What management desired was to intensify that malice and glorify it, naturalize it, and essentialize it. If that was accomplished, then any impulse of the workers to band together out of necessity would be permanently negated—and so it was done, and the workers could only watch as they were set against each other by intrigues and schemes, and then were told it was illegal
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