I wish you weren't being downvoted! If you join an organization that is union you should almost certainly join. Otherwise... You're a scab. That's how it goes. Sorry HN doesn't see reality.
"Collective labor action" is another kind of threat used against managers who might otherwise accept a better offer from other workers. We've surrendered and begin to encourage unions to perform their extortion in open court to reduce the body count.
The threat is not "a better deal or we'll quit", that's a perfectly fair response to unacceptable conditions (and "other people will take this deal" is a perfectly fair counter). The threat is "it'd be a shame if something were to happen to your business, like a lawsuit or a fire". That's the difference between negotiation and extortion, and that's what's behind all the union/mafia links.