Recommended reading - The Public Enemy, by Kubec Glasmon & John Bright (1931):

The Public Enemy

aka Beer and Blood.

By Kubec Glasmon & John Bright.

Filmed as The Public Enemy (1931), directed by William A. Wellman.

Published by Grosset & Dunlap.

Published 1931.

Hardcover.

ASIN: B0006ALC06

Description:

Photoplay novelization of the famed 1931 James Cagney classic gangster film. THE PUBLIC ENEMY (voted by the American Film Institute as the 8th greatest crime film in American film history) was a 1931 American Pre-Code crime film starring James Cagney and directed by William A. Wellman. based on a never-published novel by two former street thugs: "Beer and Blood" by John Bright and Kubec Glasmon (who had witnessed some of Al Capone’s murderous gang rivalries in Chicago!) A remarkable book in itself, one of those rare Grosset & Dunlap publications (like King Kong).