From the earliest days of the talkies, Hollywood has been fascinated by the doings - and sayings - of the 'underworld'. From the Little Caesars of the 30s to the Godfathers of the modern era, crime movies have always been a staple of Hollywood production. Through their tales of gangsters and G-Men, cops and racketeers, they not only offer exciting action but a running commentary on aspects of American society itself.