- 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.
- 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.
- He later joined Zeppo in managing The Marx Brothers and developed a good reputation as an agent.
- 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.
- Only Marx brother to be drafted and serve during WWI in the U.S. Army Air Corps.
- 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.
- Groucho's personal financial advisor.
- Groucho said on "The Dick Cavett Show" that Gummo was his favorite of the brothers.
- A 1958 episode of the NBC radio series "Monitor" (a birthday tribute to his brother Groucho) is the only publicly available recording of his voice (so far).
- Great-uncle of Jade Marx.
- Died in Palm Springs hospital.
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