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 con artist, seemingly of rural Italian origin, who wore shabby clothes, and sported a curly-haired wig and Tyrolean hat. Description above from the Wikipedia article Chico Marx, licensed under CC-BY-SA, full list of contributors on Wikipedia.
Filmography
Duck Soup
as Chicolini
A Night at the Opera
as Fiorello
Animal Crackers
as Signor Emanuel Ravelli
Horse Feathers
as Baravelli
A Day at the Races
as Tony
Monkey Business
as Chico
A Night in Casablanca
as Corbaccio
The Cocoanuts
as Pastrami
At the Circus
as Antonio Pirelli
Go West
as Joe Panello
Room Service
as Harry Binelli
The Big Store
as Ravelli
Love Happy
as Faustino the Great
That's Entertainment, Part II
as (archive footage)
The Story of Mankind
as Monk
Brother, Can You Spare a Dime?
as Self (archive footage)
The Unknown Marx Brothers
as Self (archive footage)
The Big Parade of Comedy
as One of The Marx Brothers (archive footage) (uncredited)
The Marx Brothers: Hollywood's Kings of Chaos
as Self (archive footage)