Have heard many Amazon stories around review being used by managers as a revenge tool. A true incident - a friend of mine and his coworker (same level) didn't get along. Their manager left and this coworker was made the manager since he had longer tenure. My friend received a PIP in 2 months flat and ended up leaving the company rather than put up a fight.
A similar thing happened to me outside of Amazon. When the person I didn't get along with was made my manager I immediately went outside my reporting chain to find a place to transfer (though I considered quitting on the spot)
It didn't really work out though. New team was better but my past followed me and I let the whole experience get me down.
