Earlier quoted context omitted.
Think about it this way: both sides have the right to freely negotiate a contract, and then decide whether or not to enter into it. The CEO can't prevent the workers from talking to each other and figuring out what they think a fair contract would be, and the workers can't prevent the CEO from talking to other CEOs for the same reason. The specific human right is usually referred to as "freedom of association". You c…
As you observe, workers talking to each other to agree on prices for labor is the flip side of the coin from CEOs talking to each other to agree on prices for labor. But the latter is in fact illegal. CEOs can't talk to each other and agree to pay $10/hour for warehouse workers. Coordinating with others to set prices for labor or goods isn't viewed as within the scope of freedom of association. Union activities are i…
We're moving away from areas where I'm confident I know what I'm talking about, but I think as a society we've decided that while anti-competitive laws do infringe on the rights of business leaders, we're trying to balance their rights with those of everyone else, and the laws are necessary to prevent a permanent class divide between business leaders who cannot be challenged, and workers under them. In the long run, allowing complete free association among CEOs would limit the freedoms of the rest of society.
Society is a constant project of balancing various conflicting rights, and this is one of many cases where we limit the rights of a few to defend the rights of many.