Abuse of authority, mobbing, and harassment.
Confirmed and reported cases of harassment, and many of mobbing and abuse of authority are often from managers towards employees.
I was fired after reporting I had been harassed by a colleague. Despite some witnesses, some writing and recording proofs, the stalker, who still works at Quadpack, admitted he had been harassing and threatened me for more than 8 months. He also confessed that he had accessed to confidential information from the HR and IT department and had misused it. I was not supported by the company in any of the cases; quite the opposite, the management pushed me out by forcing me to work with the stalker.