I would say it is THE best except for my fondness for "Caged." This is a brilliant movie, as shocking as Hawks's "Scarface," released a year later and far better known.
Walter Huston is a district attorney when we met him. Throughout, he is given to the one word, catchall statement or response "Yeah." Huston has rarely if ever been better -- and he was one of the greats of Hollywood history.
Phillips Holmes is excellent as a young man he sends to prison. He is innocent in all senses before he gets there. But he quickly leans the code of the title.
Constance Cummins isn't given much as Huston's daughter but she is appealing. However, Boris Karloff gives one of his very finest performances as a tough but decent prisoner. Of course, of course he is fine in "Frankenstein." And he is wildly brilliant in "Lured" many years later. Here he gives a solid, unadorned, moving performance.
Clark Marshall, a name I do not recognize, is also fine. He plays a sniveling, conniving inmate. And DeWitt Jennings is shocking as a brutal guard.
Amazingly, I had never seen this movie before tonight. It's bone I will want to see again; and I urge you to see it, too.