The Cleveland Torso Murderer, also known as the Mad Butcher of Kingsbury Run, was an unidentified serial killer who was active in Cleveland, Ohio, United States, in the 1930s. The killings were characterized by the dismemberment of thirteen known victims and the disposal of their remains in the impoverished neighborhood of Kingsbury Run. Most victims came from an area east of Kingsbury Run called "The Roaring Third" or "Hobo Jungle", known for its bars, gambling dens, brothels and vagrants. Despite an investigation of the murders, which at one time was led by famed lawman Eliot Ness, the murderer was never apprehended.

Eliot Ness was an American Prohibition agent known for his efforts to bring down Al Capone while enforcing Prohibition in Chicago. He was leader of a team of law enforcement agents nicknamed The Untouchables, handpicked for their incorruptibility. The release of his memoir The Untouchables, months after his death, launched several screen portrayals establishing a posthumous fame for Ness as an incorruptible crime fighter.