One place I left I "named names" during an exit interview. I know it didn't help right then, but I also know I wasn't the first, and I told colleagues that I named names. After a couple more people left, they also named the same names. Many months later, there was a bit of a cleanup, and the named names were dealt with. I almost wanted to go back because by all accounts it was a much healthier environment after the named were let go.