Roy Marcus Cohn

Sen. Joseph McCarthy

Walter Winchell

Joseph N. Welch

Dashiell Hammett

Dora Cohn

J. Edgar Hoover

Older Doctor

Albert Cohn

Francis Joseph Cardinal Spellman

Iva Schlesinger

Sen. Charles Potter

First Annie Lee Moss

Abe Feller

Robert F. Kennedy

Gerald Walpin

Congressman Neil Gallagher

Ethel Rosenberg

Second Annie Lee Moss

Ray Kaplan

G. David Schine

Sen. Everett Dirksen

Sen. John L. McClellan

Male Nurse

Judge Kaufman

New York Judge

Carmine Galante

Young Roy Cohn

Female Nurse

Chauffeur

Juror #9

Young Doctor

Frank Raichle

Sam Garfield

German Reporter

Peter Frazer

Milo Gandini

Secretary of the Army Robert Stevens

New York Waiter

Reporter

Clyde Tolson

English Reporter #2

Robert Morgenthau Jr.

French Reporter

FBI Agent (uncredited)

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

Restaurant Patron (uncredited)

Courtroom Reporter (uncredited)

Self (archive footage) (uncredited)