Excellent look at the unglamourous working end of the mob and an undercover operation. In the late '70s, FBI agent Joe Pistone (Depp) infiltrates the New York Bonanno crime family, under the alias of Donnie Brasco, where he's mentored by aging low-level hood Lefty (Pacino). As Joe/Donnie gets deeper into the wiseguy life, Lefty takes a fatherly pride in his protege and the agent also becomes ensnared by his new identity--to the possible detriment of both feds and family. Terrific lead performances. Based on a true story and adapted from the book by Pistone and Richard Woodley.