Marx sibling who served as a realtor for his brothers’ humor group. He briefly caused his brothers in the vaudeville circuit, but remaining acting after becoming drafted in to the military in World Battle I. He gained his nickname because he’d frequently sneak about backstage and scare other folks, just like a detective or “gumshoe.” He was wedded to Helen von Tilzer and he previously a son called Robert. His grandson Brett Marx performed Jimmy Feldman in the 1976 edition of The Poor Information Bears. His comedian brothers had been Zeppo, Harpo, Chico and Groucho Marx.