G–Men Never Forget is a 1948 American movie serial from Republic Pictures. The serial was condensed into a 100-minute feature film in 1966 under the title Code 645.

Plot

Escaped criminal Victor Murkland (Roy Barcroft) kidnaps the police commissioner and, with the aid of plastic surgery, takes his place. Federal Agent Ted O'Hara (Clayton Moore) is called in to try to stop the wave of crime initiated by Murkland, not knowing that Murkland is posing as the police commissioner and is aware of O'Haras' every move. The real commissioner is being held captive in a mental hospital run by Dr. Benson (Stanley Price). O'Hara is aided by the beautiful Sgt. Frances Blake (Ramsay Ames). Murkland's gang threatens to destroy a major tunnel being built underneath a channel, and blackmails the builder into paying him protection money.