Good, until mandated ...
The study of unions is the study of community.
Most people can't seem to separate the two types of community:
- Communities of individuals who freely choose to organize (individual right)
- Communities of groups who are mandated to organized (community right)
Unions work when people are free to individually choose if they wish to organize. People will choose to organize when an employer is abusive. When the employer is not so abusive, people will be less likely to join an union. It is the greatest example of individuals organizing into a "public good," and a good counter-balance to greedy capitalism. Employers who are ******* their employees will succum to their demands to stay in business. Employees who unionize and ask too much will be fired. All in the meantime, the government guarantees "individual rights."
Unions don't work when people are ****** to organize into unions. Not only is individual choice lost, but the government then begins enforcing "community rights." Those government mandated rights then destroy the balance of a free group against a capitalist employer. In time, then there are laws enacted to counter-balance against the unioning in favor of the employer. As we've seen both in the US and in socialist governments, over decades, you only end up with a set of bureaucratic laws that are pro-union and pro-employer laws that completely hinder the union-employer balance. Employers often either move out-of-state, out-of-country or just go out-of-business. This is why the concept of "community rights," which is the root of the communist manifesto, fails.
The best way to keep the balance in capitalism is to allow people to organize freely, by individual choice, just as businesses are allowed to be formed. You don't start giving community rights to groups, taking away their individual right to choose to join or not, and upsetting that balance, because you'll quickly find yourself doing the same for businesses. And, again, that's why we have this gross, sprawling set of conflicting pro-union and pro-business laws that prevents unions and businesses from working together anymore. The right to assembly must be by individual choice -- which is freedom. The mandated assembly in the concept of a community right over the individual -- which is why communism is mutually exclusive with freedom over time (because it takes away individual choice).
Unions aren't the problem, they are merely an assembly of people, which an individual right in a free society. It's the government laws that take away the free, individual right of assembly and mandate unions that destroy that individual freedom. All while being counter-productive result in upsetting the balance of capitalism -- first with pro-union laws, then pro-employer counter-laws that only increase the bureaucracy and reduce their effectiveness.