Robert Stack Eliot Ness Actor Walter Winchell Narrator, Producer Nicholas Georgiade Enrico Rossi Actor Abel Fernandez William Youngfellow Actor Paul Picerni Lee Hobson Actor Murray Hamilton Guest Star Martin Balsam Guest Star Harold J. Stone Guest Star Bruce Gordon Frank Nitti Guest Star Theodore Marcuse Guest Star Cloris Leachman Guest Star Frank Sutton Guest Star Don Gordon Guest Star Collin Wilcox Paxton Guest Star John Kellogg Guest Star Joseph Ruskin Guest Star Grant Richards Guest Star Bernard Fein Guest Star Herman Rudin Guest Star Oscar Beregi Jr. Guest Star Quinn Martin Producer Stuart Rosenberg Director Paul Wendkos Director Abner Biberman Director Vincent McEveety Director Bernard McEveety Director Stuart Rosenbert Director Bernard L. Kowalski Director Harry Kronman Writer George Eckstein Writer John Mantley Writer Sy Salkowitz Writer Leonard Kantor Writer David Zelag Goodman Writer Gilbert Ralston Writer Robert Yale Libott Writer Barry Trivers Writer Mel Goldberg Writer Theodore Apstein Writer