Gregory Scarpa Sr. (May 8, 1928 – June 4, 1994), nicknamed the Grim Reaper and the Mad Hatter, was an American caporegime and hitman for the Colombo crime family, as well as an informant for the FBI. During the 1970s and '80s, Scarpa was the chief enforcer and veteran hitman for Colombo boss Carmine Persico. He was sentenced to life imprisonment for three murders in 1993 and died the following year.