Pals, join a union. Do it now. Not when things kick off. There are rules against asking for help from Union Officers if the situation you’re in is active when you sign up. Don’t be the person that finds that out the hard way.
That's kind of the point, yeah. If you make it an exclusive club it's not collective bargaining, it's divisive.
I'm in the UK so may not be much use in practice, but I've joined a union right when I needed help before, and even got advice from a rep (who I didn't personally know; this wasn't just friendly advice) who knew I wasn't a member
As a union organiser, I totally get this. A person who joins a union only when they need help is also, usually, a person who will leave the union immediately after they need help. That's a person who has no sense of solidarity and is only ever going to be a drain on a union.