About Milton Marx
Milton "Gummo" Marx was the fourth-born of the Marx Brothers. 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 four brothers began their legendary film career. His military service began shortly before the Armistice and he was therefore never sent overseas. He was the only Marx Brother to have served in the military.
After leaving the army, Gummo, went into the dressmaking business. Later he joined with his brother Zeppo Marx and operated a theatrical agency. After that collaboration ended, Gummo represented his brother Groucho Marx and worked on the television show The Life of Riley, which he helped develop. He also represented other on-screen talent and a number of writers.
Gummo was given his nickname because he had a tendency to be sneaky backstage, and creep up on others without them knowing (like a gumshoe). Another explanation cited by biographers and family members is that Milton, being the sickliest of the brothers, often wore rubber overshoes, also called "gumshoes," to protect himself from taking sick in inclement weather.