Robert Stack Eliot Ness Actor Nicholas Georgiade Enrico Rossi Actor Abel Fernandez William Youngfellow Actor Paul Picerni Lee Hobson Actor Walter Winchell Narrator, Producer Michael Ansara Guest Star Steve London Actor Neville Brand Guest Star Bruce Gordon Frank Nitti Guest Star Harold J. Stone Guest Star Robert Middleton Guest Star Joseph Wiseman Guest Star Steven Geray Guest Star Will Kuluva Guest Star Michael Constantine Guest Star Barry Russo Guest Star Lalo Rios Guest Star Paul Bruce Guest Star Lewis Charles Guest Star Russ Conway Guest Star Quinn Martin Producer Walter Grauman Director Joseph Petracca Writer Stuart Rosenberg Director Paul Wendkos Director Don Medford Director Charles O'Neal Writer John Peyser Director Leonard Kantor Writer David Zelag Goodman Writer Harry Kronman Writer William Spier Writer John Mantley Writer Harry Essex Writer George Bellak Writer Richard Collins Writer Jerry Thorpe Producer, Executive Producer Josef Shaftel Producer