I saw this film in the late 70's and it has never left my mind, usually I can't even remember most films I've seen, never mind the title. Only two remain, this one and One flew over the Cuckoos nest.
Both profoundly disturbing movies and they should disturb us because they depict the brutal truth of these situations that are so often played down or sanitised. I don't often cry, but I bawled at this movie, it touched me so deeply and is imprinted on my mind. I would watch it again, brilliant and brutally honest.