Blue, I don't know where you got that picture. Granted, new hires are vulnerable,but only while on probation. Typically that is the first year. After that, unions defend all members to the full extent of their resources. Now internally, there are many cases where different groups have lost or gained based on politics and the relative voting power (and cohesion) of each group. And there are cases where junior dumped on senior as well as the reverse. When union members vote, each vote carries the same weight, regardless of seniority. Hopefully, most of the time they will try to do what is best for the whole. Also, remember that senior was junior once and junior wants someday to be senior. It is not a good idea to mess up the place you want to occupy.