My manager has demeaning and humiliating attitude!!!!!

My manager has demeaning and humiliating attitude towards me for the last two years. Examples of his behavior include his constant threats of termination and attempts to create false ground in which I would be pressurized to leave the company. He over-scrutinizes my work performance in such a way that it would jeopardize my growth and/or promotion within the company. His attitude already has driven out a co-worker who has found employment some where else, as he could not stand the humiliation. In this sort of situation what are my rights and what actions would you suggest that I take?