The East Side Kids were characters in a series of films released by Monogram Pictures from 1940 through 1945. Many of them were originally part of The Dead End Kids and The Little Tough Guys, and several of them later became members of The Bowery Boys.
When Samuel Goldwyn turned the play "Dead End" into a 1937 film, he recruited the original tough-talking kids from the play (Leo Gorcey, Huntz Hall, Bobby Jordan, Gabriel Dell, Billy Halop, and Bernard Punsly) to repeat their roles in the film. This led to the making of six other films starring The Dead End Kids. The most successful of these features were Angels with Dirty Faces (1938) with James Cagney and Humphrey Bogart, and They Made Me a Criminal (1939), starring John Garfield. Universal offered a competing series, under the Little Tough Guys brand name, later combining the Little Tough Guys cast members with the Dead End Kids (minus Gorcey) as the Dead End Kids and Little Tough Guys series.
In 1940 producer Sam Katzman, noting the financial success of other tough-kid series, made the film East Side Kids using two of the 'Little Tough Guys', Hally Chester and Harris Berger. He added former Our Gang player Donald Haines, Frankie Burke, radio actor Sam Edwards, and Eddie Brian to round out the new team. The film served as a kind of "pilot" for a possible series of films, which were eventually made possible by this film's success.