The Undercover Man [1949] [DVD]

Director Joseph H. Lewis brings his trademark stylishness to what is, ostensibly, a straightforward crime drama. Glenn Ford plays Warren, a Treasury Department agent who uses his knowledge of book-keeping to take a novel approach to take down the mob. Assisted by Pappas (James Whitmore; in his film debut) and Wolfe (James Weinberg) and supported by supportive but strong wife (Nina Foch), Warren has to weave his way, methodically, to his ultimate prize - "The Big Fellow" (think Al Capone). Of course, the road to The Big Fellow is paved through low life street thugs (including Anthony Caruso as Rocco) and O'Rourke (Barry Kelley) - the crooked lawyer for "The Syndicate." O'Rourke relishes to be able to rub his ill-gotten wealth in the lawman's face. ~ imdb