Sal Maroni

"Boss" Maroni was one of Gotham City's biggest crime bosses, but his criminal career came to a close when he was indicted by D.A. Harvey Dent on murder charges. Facing a long prison sentence for the murder of a small-time bookie, an enraged Maroni threw a concealed vial of acid at Harvey's face from the witness stand, turning him into the disfigured gangster Two-Face.