You don't mention whether you're interested only in recent films or if
you want to go back to the beginning of cinematic history, but prison and
execution films go back as far as Edison.  I suggest you read Kevin
Brownlow's BEHIND THE MASK OF INNOCENCE for silent titles; he handles
exploitation/expose titles pretty thoroughly.  The George Eastman House
has a 1924 (?) talkie short with the then-warden of Sing Sing, which you
might find of interest.
I recommend Carlos Clarens' book CRIME MOVIES and the chapter called "Our
Fine Fettered Friends" in FROM SCARFACE TO SCARLETT.  My own personal
favorite prison film is EACH DAWN WE DIE, with BRUTE FORCE a distant
Hope that helps!
Kathy Harper
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