William F. Roemer Jr. (June 16, 1926 – June 14, 1996) was an FBI agent for 30 years. He is known for his battle against organized crime and being the most highly decorated agent in FBI history. After retirement he became a private attorney for businesses being muscled by the mob. He was the author of several books, including biographies on mobsters Tony "The Ant" Spilotro and Tony "Joe Batters" Accardo. Throughout his career, he encountered and dealt with Felix "Milwaukee Phil" Alderisio, Gus Alex, Jackie "The Lackey" Cerone, Sam "Mooney" Giancana, Murray "The Camel" Humphreys, "Mad" Sam DeStefano, Joseph Bonanno, and , among others. Roemer died in 1996 of lung cancer, just two days before his 70th birthday.