One Flew Over the Cuckoo's Nest (1975)

Genre: Drama
Tagline: If he's crazy, what does that make you?
Starring: Jack Nicholson, Louise Fletcher, William Redfield, Brad Dourif

Plot: Upon arrival at a mental institution, a brash rebel rallies the patients together to take on the oppressive Nurse Ratched, a woman more a dictator than a nurse.

http://www.imdb.com/title/tt0073486/
http://en.wikipedia.org/wiki/One_Flew_Over_the_Cuckoo's_Nest_(film)