My experience with unions is setting up a booth for a trade show and being unable to plug into the outlets myself because I had to wait for a union electrician.
Total scam.
Total scam.
But setting up or carrying things things during the day had to use union people.
Maybe. Maybe not. Maybe the union electrician is there because once upon a time someone setting up a booth daisy chained a bunch of extension cords of small gauge to run lights and demos and started an electrical fire in a crowded convention hall.