The Famous Muldoon, the wrestler was a fellow named William Muldoon, a New Yorker of the late 19th century. He won renown by winning bouts in Harry Hill's, a famous concert saloon on Houston Street. He was also a cop and later an actor. He was also a boxing trainer (John L. Sullivan was one of his trainees), a member of the NY State athletic commmission and the operator of the "Muldoon Institute," a fitness outfit that catered to celebrities. Edward Harrigan's song "Muldoon, the Solid Man" was not written about him (it was about a fictional politician), but many people thought it was.