> They don't? Employers cannot fire striking employees. Or fire any that may look like retaliation for union activity.
Who said anything about that? Scab labor is an extremely common thing. How you come to the conclusion that "the company is not allowed to hire other people to replace the striking workers", I'm entirely unsure. For two very popular examples, both in the air travel industry, both pilot's strikes and ATC strikes have had "other people hired to replace striking workers", with varying degrees of notoriety (being at Boeing, I can't imagine you being entirely unaware of either).
> That's simply not true.
Many employment contracts have "no moonlighting" clauses. Only two states specifically forbid them: Washington, and Washington DC (and Washington's policy only affects lower-paid workers) (https://sbshrs.adpinfo.com/blog/7-faqs-about-moonlighting-po... and https://www.rocketlawyer.com/business-and-contracts/employer...)
