The Undercover Man

The Undercover Man is a 1949 American crime drama film noir starring Glenn Ford. This was one of a number of noirs directed by Joseph H. Lewis, who went on to helm Gun Crazy and The Big Combo. The drama features Glenn Ford, Nina Foch, James Whitmore, among others.

The film was based on an article entitled He Trapped Capone, the first part of the autobiography Undercover Man by Federal Agent Frank Wilson, which was serialized in Colliers in 1947.Many details were fictionalized. The timeframe was changed from the Prohibition era to the postwar era. Chicago became an unnamed, fairly nondescript big city. Capone was referred to only as the shadowy Big Fella and only photographed from the rear, and was a more diversified mobster rather than primarily a bootlegger reflecting the change in US organized crime following Prohibitions repeal. And of course, IRS Criminal Investigator Frank Wilson became IRS Criminal Investigator Frank Warren. ........

Source: Wikipedia