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

Chuck Aber

Sen. John L. McClellan

Lamont Arnold

Male Nurse

Steve Aronson

Judge Kaufman

Bernard Canepari

New York Judge

Sam Coppola

Carmine Galante

Brandon Danziger

Young Roy Cohn

Patricia Dunnock

Female Nurse

David Early

Chauffeur

Fanni Green

Juror #9

Lance Lewman

Young Doctor

Larry John Meyers

Frank Raichle

Zachary Mott

Sam Garfield

Marty Roppelt

German Reporter

Joe Petruzzi

Peter Frazer

Joseph Scoren

Milo Gandini

John Seitz

Secretary of the Army Robert Stevens

Jack Skelly

New York Waiter

Robin Thomas

Reporter

Daniel von Bargen

Clyde Tolson

Don Wadsworth

English Reporter #2

Rick Warner

Robert Morgenthau Jr.

Kate Young

French Reporter

Rik Billock

FBI Agent (uncredited)

Nikolai Bulganin

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

Christopher Cussat

Restaurant Patron (uncredited)

John W. Iwanonkiw

Courtroom Reporter (uncredited)

Gary Cooper

Self (archive footage) (uncredited)