6,000 Enemies [1939] [DVD]

From imdb: Walter Pidgeon is a tough and honest D. A. He gets framed for bribery, convicted and sent to prison, while his brother, John Arledge works to figure out who framed him. Pidgeon has other problems, to wit the many convicts whom he convicted and sent to the pen. MGM frequently claimed they produced no B movies, but this one has all the hallmarks, including direction by the always competent George Seitz, and camerawork by John Seitz. That's not to say it didn't have the MGM gloss on it, and the sequence in which Pidgeon earned the respect of his fellow cons by getting into the boxing ring with Nat Pendleton and being pounded into unconsciousness has a crowd of hundreds dressed in prison greys watching the fight; let's just say that an MGM programmer had the budget of an A picture at Columbia or Universal, and showed the money on the screen.