Hi, guys! First post here. I have an issue at my hub. I've been working at my hub for 2 and a half years now. I've been trying to be permanent on the sort aisle but they abuse me and put me wherever they want. Recently, they've been putting an unloader with 11 months seniority in my spot while making me go load or make me take the place of whoever called in (since I decided to learn how to do it all). Noticing this, I decided to tell the supervisors no when they ask me to come do something. When this happens, they go to the manager and he makes me go do something. Today, I finally told my manager I wasn't going to leave the sort aisle because I had more seniority than the unloader. He told me since I had more seniority "we both go or we can walk out". The unloader and I went to the area and the unload sup came and took him and put him on the sort aisle and left me out. I talked to my union steward at break and said I could file a grievance on a SUPERVISOR tomorrow if it happened again. I suppose I can file on the unload sup but would that solve my problem or is there another alternative?