"They should kill them all before they are born."
The New York Times calls it "brutal and unrelenting". Slant Magazine gives it 4 out of 4 stars.
The New Yorker opens with this:
Set in Mexico, Luis Buñuel’s ruthless—almost surgical—examination of how the poor prey on one another is the most horrifying of all films about juvenile crime. The one masterwork on this subject, it stands apart from the genre by its pitilessness, its controlled passion.FilmReference.com says, "Los olvidados was Luis Buñuel's favorite film". Rotten Tomatoes has a critics score of 94%.