I was under the impression that the taft-hartley only gave workers the right to employment without joining the union, I didn't know it applied to giving them the same wages also.
14(b) of the Taft-Hartley act gives individual states the authority to enact right-to-work laws. RTW laws mandate that a member of the bargaining unit (in our case, any non-management person working for UPS under 'covered work' that the Teamsters bargain on behalf of) that doesn't opt-in for union membership receive any and all benefits as a rank-and-file union member would, as far as wages, working conditions, and representation (discipline, filing grievances, et cetera).
I have to file their grievances, but I sure as hell don't have to tell them which article to cite or give them the forms. I have to represent them during disciplinary action, but representation can consist of me shrugging my shoulders and scratching my ass. I also don't have any sort of legal obligation to go out of my way to make sure they're not getting screwed over by management.