It was initially headed by Louis "Lepke" Buchalter and later by Albert "The Mad Hatter" Anastasia. Murder, Inc. was believed to be responsible for between 400 and 1,000 contract killings,[2] until the group was exposed in 1941 by former group member Abe "Kid Twist" Reles. Murder, Inc. committed hundreds of murders on behalf of the National Crime Syndicate during 1929 through 1941.