They’re mafias, first of all. The most textbook possible case of a racket.
There is a reason the actual mafia found it the perfect vehicle. Still today, wherever there is a union, there is an arm of the local organized crime. This isn’t even disputed.
Second of all, these are the things they accomplish:
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Force the competitive workers to pull the weight of the useless bums,
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Raise the cost of labour so that there is a pay ceiling, first, and a much reduced labour pool, second, severe inflation accross the economy, third. The third point is important, because the money extorted from the employers then doesn’t even go as far as lesser pay would without unions.
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Retard progress by adding miles of red tape around any enterprise.
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Reduce the overall quality of the work, with teachers being the best possible example.
Third of all, in a “free market,” if there were no laws one way or the other, employers have much more muscle and can just eliminate unions in a gang type war. Becase, left without legalized regulation, that is what unions do, and have always done. Gang war tactics. They would lose that war in every case without the state protecting them. So, for humanitarian reasons, best to skip the whole thing all together and make them illegal.
Of course, employers aren’t the only ones extorted and coerced. Normal ass people who just want to work and negociate with employers on their own terms, and work whenever the fuck they want under whatever terms they prefer, are coerced by these mafias.
Ask anybody that has ever worked in a unionized industry whether they ever had a say in any of the shit imposed on them. Or, for example, paying union fees.
Your point about why don’t disgruntled workers just start their own thing, their own company or coop or whatever stupid shit, is one which passing straight over the heads of dirty communists is proof that they are not only unable to use reason, but uninterested. Whenever they do, it either goes broke or cannot scale, or is just a normal succesful company like any other.
The reason operations by disgruntled workers tend to fail is that the disgruntled workers tend to be the useless pieces of shit. Competitive people tend to just do very well and get promoted and be company men all the way. They thrive under the sophisticated infrastructure that is provided to them. Except where unions exist and no real way exists for them to reap the benefits of being excellent.