Kev,
I was referring to the part highlighted in Red, the context of my reply should have made that obvious. I apologize if it didn't. As for the part highlighted in blue, is at best an anecdotal story, without factual context. Perhaps a company in a Teahadist state might get away with that, Amy's baking company comes to mind, but I seriously doubt that a corporation with a dedicated HR department would risk doing something like that. If the incident did occur, I would be willing to bet that it had more to do with violating social media policies, than posting union rhetoric. Just ask that AA AMT that went on a rant on youtube, that was terminated, and the union wasn't able to do anything about it.
Ironic that I do allude to George Orwell in my signature...