I think elders are the worst, especially when it comes to divulging details of judicial committee meetings and other private stuff. I know first-hand. They feel that it's okay to tell another elder, whether it's in the same congregation or not, why someone was reproved or disfellowshipped. It's happened many, many times in my area.
I always thought it was a joke when they would give talks about elders keeping what is said within the 4 walls of the back room. HA! It was always amazing how everyone knew exactly why someone had been disfellowshipped. I can't remember one time hearing about someone getting df'd and not being told the reason. Pretty much the same held true for those that were reproved, but don't even get me started on that one. They give a "local needs" part at the service meeting about the offense. It doesn't take a rocket scientist to figure out who (or is it whom) the talk is about. I would much rather be disfellowshipped than reproved.