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X revokes paid blue check from United Auto Workers after strike called
(arstechnica.com)
This is a most excellent place for technology news and articles.
Well, I think this might, but probably not, technically qualify as an anti-union action in violation of state and federal laws. Basically, if you do things to silence or discredit the union and advocates then you've broken the law. That said, companies get away with a lot worse, so something as minor as the blue check disappearing is not likely to have any real backlash.
Definitely shows where he stands on these issues if it ever wasn't clear. Musk is unfortunately a person with a lot of influence on business and politics.