I've been working as a unloader/package handler for 3 weeks and I've been constantly been told by one supervisor that I need to work at a faster pace, even though the fastest I can go is 21 packages per minute. They expected me to go 26 packages per minute today, despite that I've been trying to follow safety procedures. When I do try harder to work at the pace they want me to work at, I put myself at a higher risk of injurying myself, so I guess either way, my efforts are never good enough to them. Anyways, I ask this question because I've been told by a SPA person of mine today for unload that he's overheard some of the supervisors saying that they're planning on trying to get rid of me before I gain my seniority because I'm "too slow" even when I've been going 21 packages per minute for most of the time(with a few slow downs because of large and heavy packages blocking my way). However, a few other long-time preloaders have told me they technically can fire me for whatever reason they want(regardless of how stupid the reasons behind my termination are) but at the same time, they can't tell me to work at a certain pace they want me to since it says no where in the UPS employee book that that supervisors can tell their pt unloaders to work at that certain pace, as long as I work at a steady but safe pace(following safety procedures). They've also told me that even if they can fire me whenever they want, they really won't since they have too many holes. The funny thing is, none of the supervisors have told me upfront that they feel like getting rid of me for my production rate. It's not that I'm intimidated by supervisors but I do already have more than enough problems already outside of work and I don't want some of the crappy supervisors to add up to my list of problems I have to deal with on a daily basis. How would you guys deal with this as your advice to me?