So it isn't like you've been free and clear to not have a union interfere with you being hired.
It took the supreme court (which over threw its own ruling) to remove this.
Additionally, even in places where you have union and non-union employees, the unions can make things difficult, and costly for non-union employees. My personal experience was that I removed from a wall mount a wi-fi router, rebooted it, and placed it back on the wall.
This resulted in me reprimanded, my department having to pay a 4 hour call out fee, to the union electrician.
So, my choices are to call out a union electrician to service the mounted piece of equipment. Or "accidentally" bump the IO switch on the surge protector.
It was this, and countless other stupid shit, that made me really dislike working in a place with a union.