Robert Stack as Eliot Ness

Keenan Wynn as Joe Fuselli

Barbara Nichols as Brandy LaFrance

Pat Crowley as Betty Anderson

Bill Williams as Martin Flaherty

Joe Mantell as George Ritchie

Bruce Gordon as Frank Nitti

Neville Brand as Al Capone

Peter Leeds as

Eddie Firestone as

Robert Osterloh as

Paul Dubov as

Abel Fernandez as

Wolfe Barzell as Picco

John Beradino as Johnny Giannini