I’m union (USPS) and the only thing I’d ever do that would require me to go to the union is a schedule change, and the only reason for that is so the union can make sure I’m of sound mind and making this decision out of personal interest and not at the request/insistence of management - I have a schedule and any time worked outside of that is at time and a half, so if management wants me to change my hours for them, they gotta start paying me 50% more, or just give me overtime. Unions are cool