Mike Powers...
Donald Cook’s "Mike Powers" was such a one-dimensional character. The character was so ridiculous in his "convictions" - which is doing everything by the book, by the law all the time, every time. Never did he stop to ponder his actions, his beliefs and his motives. It was good vs. evil; absolutely no shades of gray. This was a very ineffective character.
An overgrown boy scout.
Donald Cook’s most effective scene was the last one in the movie. If only his character had some development written in the script he might be rather likable.
In 1938's Angels with Dirty Faces (which I think is a better film) Cagney plays a tough gangster, a crazy maniac really. Pat O’Brien plays Cagney’s boyhood friend who is now a priest at a local school for troubled youths. Cagney and O’Brien’s scenes together have a real sincerity. Both were once hoodlums – now one is a priest and the other running from the law. It's a remarkable flick.