I work in the heaviest trailer on my belt with one other loader. This trailer is at the end of the belt and generally receives between 100 and 200 miss-sorts per night. That's not an exaggeration. My FT supe has made the pickoff shut off the belt and come clean them up one time when they were stacked chest-high on both sides of the extendo. Most night we just toss them out of the trailer and stack them up on carts at the end of the night. Monday, before the start of the shift, the PT supe tells me and the other guy who works in KC (our trailer) that too many miss-sorts are still being sent to KC and it's been a problem for awhile. He tells us that his instructions from now on are that we are to physically walk each and every miss-sort out of the trailer and to the miss-sort chute. He is to observe us. The first 2 times he sees us do something other than walk the miss-sort will be verbal warnings, 3rd time is a warning letter and 4th time will result in us being written up (he didn't say what would happen the 5th time.) He stated, and I clarified that even though the walk is the "way you're supposed to do it anyways." he will not be looking for that in any other trailers and that procedure of discipline will not apply to any other loaders on my belt. So, long story shot, I'm being told that I'm going to be disciplined differently from the people in the next trailer over and punished for things that everyone else on the belt does. (Standard procedure is to put the box on the catwalk outside the trailer and hope the floor guy grabs it.) If he tries to discipline me or the other loader at all, can we grieve him?