James Woods

Character: Roy Marcus Cohn

Joe Don Baker

Character: Sen. Joseph McCarthy

Joseph Bologna

Character: Walter Winchell

Ed Flanders

Character: Joseph N. Welch

Frederic Forrest

Character: Dashiell Hammett

Lee Grant

Character: Dora Cohn

Pat Hingle

Character: J. Edgar Hoover

John McMartin

Character: Older Doctor

Josef Sommer

Character: Albert Cohn

Daniel Benzali

Character: Francis Joseph Cardinal Spellman

Tovah Feldshuh

Character: Iva Schlesinger

John Finn

Character: Sen. Charles Potter

Frances Foster

Character: First Annie Lee Moss

Allen Garfield

Character: Abe Feller

David Marshall Grant

Character: Robert F. Kennedy

Joe Grifasi

Character: Gerald Walpin

Daniel Hugh Kelly

Character: Congressman Neil Gallagher

Karen Ludwig

Character: Ethel Rosenberg

Novella Nelson

Character: Second Annie Lee Moss

Peter Maloney

Character: Ray Kaplan

Jeffrey Nordling

Character: G. David Schine

Fritz Weaver

Character: Sen. Everett Dirksen

Chuck Aber

Character: Sen. John L. McClellan

Lamont Arnold

Character: Male Nurse

Steve Aronson

Character: Judge Kaufman

Bernard Canepari

Character: New York Judge

Sam Coppola

Character: Carmine Galante

Brandon Danziger

Character: Young Roy Cohn

Patricia Dunnock

Character: Female Nurse

David Early

Character: Chauffeur

Fanni Green

Character: Juror #9

Lance Lewman

Character: Young Doctor

Larry John Meyers

Character: Frank Raichle

Zachary Mott

Character: Sam Garfield

Marty Roppelt

Character: German Reporter

Joe Petruzzi

Character: Peter Frazer

Joseph Scoren

Character: Milo Gandini

John Seitz

Character: Secretary of the Army Robert Stevens

Jack Skelly

Character: New York Waiter

Robin Thomas

Character: Reporter

Daniel von Bargen

Character: Clyde Tolson

Don Wadsworth

Character: English Reporter #2

Rick Warner

Character: Robert Morgenthau Jr.

Kate Young

Character: French Reporter

Rik Billock

Character: FBI Agent (uncredited)

Nikolai Bulganin

Character: Self (Parade Saluter) (archive footage) (uncredited)

Christopher Cussat

Character: Restaurant Patron (uncredited)

John W. Iwanonkiw

Character: Courtroom Reporter (uncredited)

Gary Cooper

Character: Self (archive footage) (uncredited)