Those High Grey Walls

Those High Grey Walls is a 1939 American crime film directed by Charles Vidor and starring Walter Connolly and Onslow Stevens. 
It is also known as The Gates of Alcatraz.
Plot.
Dr. MacAuley, a kindly beloved country doctor, is sent to Fillmore Prison. His Crime was for removing a bullet from a young man who was escaping from the police.