Tom Powers ( James Cagney, "The Public Enemy," 1931): Never has a man treated a grapefruit -- nor the woman whose face receives it -- so roughly.
Rico Bandello (Edward G. Robinson, "Little Caesar," 1931): This snarling mob hopeful was willing to eliminate anyone who stood in his way of accruing ever-greater power.
Bonnie Parker and Clyde Barrow ( Faye Dunaway and Warren Beatty, "Bonnie and Clyde," 1967): "They're young, they're in love, and they kill people." That line in the film's ads pretty much said it all.
Sonny Corleone ( James Caan, "The Godfather," 1972): Several family members could have made this list, but we're opting for hotheaded Sonny, whose temper made him fascinating to watch ... and, inevitably, led him to a memorably violent exit.
Tony Montana ( Al Pacino, "Scarface," 1983): You can't do this list without including the proudly strutting, relentless power seeker whose ultimate moment came when he raised a machine gun about as big as he was and declared to his enemies, "Say hello to my little friend!"
Al Capone ( Robert De Niro, "The Untouchables," 1987): Arguably history's most notorious mobster has had numerous screen incarnations, but De Niro's mix of subtle style and immediate fury (think "baseball bat") is indelible.
Tommy DeVito ( Joe Pesci, "GoodFellas," 1990): Absolutely unpredictable from one moment to the next -- as one young waiter found out the hard way by returning one of Tommy's many wisecracks -- this manic would-be "made man" rightfully earned his portrayer an Academy Award.
John Rooney ( Paul Newman, "Road to Perdition," 2002): One of the most effectively low-key mobsters the screen has yielded in recent years, this patriarchal town kingpin wasn't above ordering a "hit" on one of his most loyal deputies to protect his own interests.
Frank Costello ( Jack Nicholson, "The Departed," 2006): Allegedly inspired by Boston's Whitey Bulger, this mob veteran unwittingly becomes the patron of an undercover policeman posing as a gangland wannabe.