Walter Winchell

as Narrator

Robert Stack

as Eliot Ness

Nicholas Georgiade

as Agent Enrico Rossi

Paul Picerni

as Agent Lee Hobson

Abel Fernández

as Agent William Youngfellow

Steve London

as Agent Jack Rossman

Bruce Gordon

as Frank Nitti

Frank Wilcox

as District Attorney Beecher Asbury

Jerry Paris

as Agent Martin Flaherty

Anthony George

as Agent Cam Allison