10 of the Most Memorable Betrayals in Movies

6. Joe Pistone €- Donnie Brasco

Donnie Brasco is one of those neglected gangster movies that never seems to get the attention it deserves. It's a true story in which Johnny Depp plays Joe Pistone, an FBI agent who is attempting to infiltrate the mob, and in doing so befriends mob veteran Lefty, played brilliantly by Al Pacino. The relationship that forms between Lefty and Donnie Brasco (Pistone's undercover ego) is both intimate and believable, which makes the impending betrayal hard to bear, even if it is for the greater good.