Which 1939 film marked Sidney Lumet’s movie-acting debut?

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Sidney Lumet in a tuxedo holds his Honorary Academy Award and smiles backstage at the 77th Annual Academy Awards, with a gold Oscar statue in the background. — Sidney Lumet American director Sidney Lumet after receiving an Academy Award for lifetime achievement, 2005.

Sidney Lumet’s movie-acting debut was in the 1939 film …One Third of a Nation….1

While Lumet is widely celebrated as an American director, he began his career as a child actor in the theater and appeared in Broadway productions before transitioning to film.1