David Berkowitz was a serial killer active in the 1970s in New York City and was known by the name Son of Sam.
A child from an Italian immigrant family, Al Capone (a.k.a. 'Scarface') rose to infamy as the leader of the Chicago mafia during the Prohibition era.
Paul Castellano is best known for becoming the boss of the Gambino crime family in New York City.
Sammy "The Bull" Gravano, a mobster turned government witness, is best known for testifying against his mafia associates in exchange for government protection.
Ted Kaczynski is a mathematician best known for a campaign of letter bombs he sent as "The Unabomber" over a 20 year period, resulting in three fatalities.
Henry Lee Lucas was a murderer best known for allegedly killing hundreds of people in the 1960s and '70s, though only three (including his mother) were confirmed.
"Baby Face" Nelson was a gangster, bank robber and triggerman who work for Al Capone and John Dillinger.
Phil Spector is best known for writing several No. 1 hit songs, and for being convicted of the murder of Lana Clarkson.