If you go on strike for a genuine grievance, you generally can't be fired for that. Basically they're asking the court to determine if it's a genuine grievance,

If you go on strike for a genuine grievance, you generally can't be fired for that. Basically they're asking the court to determine if it's a genuine grievance, or if these people just aren't showing up to work. And if they're just not showing up to work, then the company can fire them. (NB: I'm generalising. This applies in some other countries, not sure about the US). There are also some professions where you don't want them to strike, and disputes should be worked out through some other arbitration process (think emergency services personnel - if paramedics go on strike, there can be some pretty severe consequences).