Milton "Gummo" Marx (October 23, 1893 – April 21, 1977) was an American vaudeville performer and theatrical agent. He was the second youngest of the five Marx Brothers. Born in New York City, he worked with his brothers on the vaudeville circuit, but left acting when he was drafted into the U.S. Army during World War I, years before his brothers (Groucho, Harpo, Chico, and Zeppo) began their film career.
His older brother Groucho Marx, who passed away only four months after him, was never told of his death as his family believed that it was a kindness not to tell him.
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He was portrayed by actor Gary Raucher in the Broadway musical "Minnie's Boys," which ran an at the Imperial Theatre for 80 Performances from Mar 26 to May 30, 1970.
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His nickname, and those of his brothers, were elicited by a comic strip called "Knocko the Monk," which triggered a brief rash of nicknames ending in -o. During a backstage poker game in a vaudeville house, another performer, while dealing cards, offered "a card for Chick-o," the brother who chased the chicks, and then "a card for Harp-o," the brother who played the harp. Gummo's nickname came from his habit of sneaking up on people backstage, like some kind of "gumshoe" detective.
He left The Marx Brothers just when they were reaching popularity because he felt he lacked the performing skills of his brothers. He joined the military instead to help with the war and was replaced by his younger brother.
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He later joined Zeppo in managing The Marx Brothers and developed a good reputation as an agent.