James Woods
Roy Marcus Cohn
Joe Don Baker
Sen. Joseph McCarthy
Joseph Bologna
Walter Winchell
Ed Flanders
Joseph N. Welch
Frederic Forrest
Dashiell Hammett
Lee Grant
Dora Cohn
Pat Hingle
J. Edgar Hoover
John McMartin
Older Doctor
Josef Sommer
Albert Cohn
Daniel Benzali
Francis Joseph Cardinal Spellman
Tovah Feldshuh
Iva Schlesinger
John Finn
Sen. Charles Potter
Frances Foster
First Annie Lee Moss
Allen Garfield
Abe Feller
David Marshall Grant
Robert F. Kennedy
Joe Grifasi
Gerald Walpin
Daniel Hugh Kelly
Congressman Neil Gallagher
Karen Ludwig
Ethel Rosenberg
Novella Nelson
Second Annie Lee Moss
Peter Maloney
Ray Kaplan
Jeffrey Nordling
G. David Schine
Fritz Weaver
Sen. Everett Dirksen
Sam Coppola
Carmine Galante
David Early
Chauffeur
Lance Lewman
Young Doctor
Larry John Meyers
Frank Raichle
Joe Petruzzi
Peter Frazer
Joseph Scoren
Milo Gandini
John Seitz
Secretary of the Army Robert Stevens
Robin Thomas
Reporter
Daniel von Bargen
Clyde Tolson
Don Wadsworth
English Reporter #2
Nikolai Bulganin
Self (Parade Saluter) (archive footage) (uncredited)
John W. Iwanonkiw
Courtroom Reporter (uncredited)
Gary Cooper
Self (archive footage) (uncredited)