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1. Employers are prohibited from saying that they will fire people who vote for unionization but they are allowed to say that they might shut down a shop that votes for a union. Interestingly, while this is a frequent threat, the instances of an employer ever actually following through are vanishingly small.
The more common occurrence is for the employer to let the union go on strike. Then the employer keeps the shop open by hiring new workers from outside the union and lets the union stay on strike forever. Obviously the effect on the union workers is basically the same.
He goes back to the diner/bakery to demand his job back.
Also, Colt is famous for doing this and it didn't work out so great for them : https://www.nytimes.com/1990/04/01/nyregion/workers-rejoice-...
They're also a defense contractor, so you're effectively talking about a public sector union and the dynamics of that are completely different.
If you start hiring permanent replacements, you're basically killing any chance of a successful negotiation.
[1] https://www.theverge.com/2021/2/17/22287191/amazon-alabama-w...