Robert Stack Eliot Ness Actor Nicholas Georgiade Enrico Rossi Actor Abel Fernandez William Youngfellow Actor Paul Picerni Lee Hobson Actor J.D. Cannon Guest Star Walter Winchell Narrator, Producer Barbara Stanwyck Guest Star Dane Clark Guest Star Steve London Actor Bruce Gordon Frank Nitti Guest Star Michael Constantine Guest Star Peggy Ann Garner Guest Star Richard Bakalyan Guest Star Frank Sutton Guest Star Robert Bice Guest Star Joe De Santis Guest Star Malachi Throne Guest Star Stefan Gierasch Guest Star Grace Lee Whitney Guest Star Jerry Oddo Guest Star Quinn Martin Producer Robert Butler Director Herman Groves Writer Allan Reisner Director Alex March Director Leonard Horn Director John Mantley Writer Ida Lupino Director Walter Grauman Director Paul Stanley Director Harry Kronman Writer John D. F. Black Writer Harold Gast Writer George Eckstein Writer Paul Wendkos Director David Zelag Goodman Writer Tony Barrett Writer Leonard Freeman Executive Producer Alvin Cooperman Producer