Sam "Mad Sam" DeStefano was an Italian-American gangster who became one of the Chicago Outfit's most notorious loan sharks and sociopathic killers. Chicago-based Federal Bureau of Investigation (FBI) agents, such as William F. Roemer, Jr., considered DeStefano to be the worst torture-murderer in the history of the United States. The Outfit used the mentally unstable and sadistic DeStefano for the torture-murders of Leo Foreman and Arthur Adler, the murder of DeStefano's younger brother, Michael DeStefano, Outfit enforcer and fellow loan shark William "Action" Jackson and many others. However, due to DeStefano's deranged mental state, the Outfit never let him become a made man. At least one Outfit insider, Charles Crimaldi, claimed DeStefano was a Devil worshipper.