I have seen that site. Believe it or not there is no basis for a lawsuit until they can prove damages. It would be frivolous at this point. The burden of proof that the said defendants caused harm to the company would be difficult or impossible to prove, because no flights were canceled and nobody has participated in any action as of yet. The standard of proof in a civil case is 'clear and convincing evidence' or 'the preponderance of evidence'. Until any said sickout, no harm has actually taken place. Therefore there is nothing to sue for at this point. Discussion groups are not illegal. If anything they could be preparing to file an action right after such event, requesting an emergency injunction. But they'll have to wait and see what happens.