The Marx Brothers were an American family comedy act, originally from New York City, that enjoyed success in Vaudeville, Broadway, and motion pictures from the early 1900s to around 1950. Five of the Marx Brothers’ thirteen feature films were selected by the American Film Institute as among the top 100 comedy films, with two of them (Duck Soup and A Night at the Opera) in the top twelve.

The core of the act was the three elder brothers, Chico, Harpo and Groucho; each developed a highly distinctive stage persona. The two younger brothers, Gummo and Zeppo, did not develop their stage characters to the same extent, and eventually left the act to pursue other careers. Gummo was not in any of the movies; Zeppo appeared in the first five.

Born in New York City, the Marx Brothers were the sons of Jewish immigrants from Germany and France. Their mother, Minnie Schönberg, was from Dornum in East Frisia; and their father, Simon Marx (whose name was changed to Samuel Marx, and who was nicknamed "Frenchy") was a native of Alsace and worked as a tailor. The family lived in the then-poor Yorkville section of New York City's Upper East Side, between the Irish, German and Italian quarters.

Leonard "Chico" Marx (March 22, 1887 – October 11, 1961) was an American comedian and film star as part of the Marx Brothers. His persona in the act was that of a dim-witted albeit crafty con artist, seemingly of rural Italian origin, who wore shabby clothes, and sported a curly-haired wig and Tyrolean hat.

As the first-born of the five Marx Brothers, he also played an important role in the management and development of the act, at least in its early years.

Marx used an Italian persona for his on-stage character; stereotyped ethnic characters were common with vaudevillians. The obvious fact that he was not really Italian was referenced three times on film. In their second feature, Animal Crackers, he recognizes someone he knows to be a shady character impersonating a respected art collector:

Ravelli (Chico): "How did you get to be Roscoe W. Chandler?"
Chandler: "How did you get to be Italian?"
Ravelli: "Never mind—whose confession is this?"

In Duck Soup, when Chico impersonates Groucho but retains his accent, Margaret Dumont asks what happened to his voice. Chico replies, "Well, maybe sometime I go to Italy and I'm practicing the language." To which Dumont replies, "Your dialect is perfect."

Julius Henry "Groucho" Marx (October 2, 1890 – August 19, 1977) was an American comedian and film and television star. He is known as a master of quick wit and widely considered one of the best comedians of the modern era. His rapid-fire, often impromptu delivery of innuendo-laden patter earned him many admirers and imitators. He made 13 feature films with his siblings the Marx Brothers, of whom he was the third-born. He also had a successful solo career, most notably as the host of the radio and television game show You Bet Your Life. His distinctive appearance, carried over from his days in vaudeville, included quirks such as an exaggerated stooped posture, glasses, cigar, and a thick greasepaint mustache and eyebrows. These exaggerated features resulted in the creation of one of the world's most ubiquitous and recognizable novelty disguises, known as "Groucho glasses", a one-piece mask consisting of horn-rimmed glasses, large plastic nose, bushy eyebrows and mustache.

In a 1950 radio episode of You Bet Your Life, Groucho stated that he was born in a room above a butcher's shop on 78th Street in New York City.