Robert Stack

Eliot Ness (archive footage)

Neville Brand

Al Capone (archive footage)

Paul Bruce

Richard Carlyle

Lewis Charles

Russ Conway

Abel Fernandez

William Youngfellow (archive footage)

Eddie Firestone

Nicholas Georgiade

Enrico Rossi (archive footage)

Bruce Gordon

Frank Nitti (archive footage)

John Hoyt

Capone's attorney (archive footage)

Charles Lane

Frank London

Steve London

Jack Rossman (archive footage)

Gavin MacLeod

Gregg Palmer

Paul Picerni

Agent Lee Hobson (archive footage)

Lalo Rios

William Schallert

Robert F. Simon

James Westerfield

Frank Wilcox

U.S. Attorney Beecher Asbury (archive footage)