Criminally underrated
Why this film doesn't receive more praise is beyond me. Perhaps because it doesn't fit neatly into one genre (notice how many "great films" of the 30s and 40s tend to be "genre" films?). It's part prison/crime drama, part social statement, with possibly tinges of the gangster film genre, at least in theory (although James Allen is no gangster).
It's one of the most powerful films I've ever seen. Well acted, brutally realistic.
Paul Muni is probably best known today for his later "historical" roles in films for Warner Bros., such as THE LIFE OF EMILE ZOLA and JUAREZ. (Of course, present day audiences may know him best as the original "Scarface"). In my opinion, this film offered him the performance of a lifetime.