I don't want to downplay the consequences of a strike, but that's the whole power of unions. How to you fine somebody for not working? Take it out of the paycheck that they're not earning? In the modern era, in the US, people aren't getting murdered for striking. Is it a possibility? Sure, but even with everything going on, not realistic. Then we're back to arresting people which doesn't help the company in any way.

I understand that this is all an over simplification of the situation, but at a high level, this is the whole point of workers unions.