Gangs of New York on AllMovie

In this crime drama, an undercover cop infiltrates a crime syndicate being run by an incarcerated mob boss who conducts his business via a short-wave radio concealed in his cell. The boss is caught and placed in solitary confinement. The cop, the boss's physical double, takes his place. Soon changes in the gang's activities are subtly made. The "boss" orders his mob to keep careful records of their activities. Ostensibly, this is to make the organization more businesslike, but of course, it is really to gather enough evidence to convict them all. Trouble ensues when the real boss escapes from jail. A shoot-out ensues.