J. Edgar Hoover

Broderick Crawford

Clyde Tolson

Dan Dailey

Young Hoover

James Wainwright

Lionel McCoy

José Ferrer

Robert F. Kennedy

Michael Parks

Carrie DeWitt

Ronee Blakley

Florence Hollister

Celeste Holm

Dwight Webb

Rip Torn

Melvin Purvis

Michael Sacks

Martin Luther King

Raymond St. Jacques

Pres. Franklin D. Roosevelt

Howard Da Silva

Dave Hindley

John Marley

Pres. Lyndon B. Johnson

Andrew Duggan

Hoover's Mother

June Havoc

Attorney General Harlan Stone

Lloyd Nolan

Damon Runyon

Jack Cassidy

Quentin Reynolds

George Plimpton

FBI Secretary

Ellen Barber

Walter Winchell

Lloyd Gough

Alvin Karpis

Brad Dexter

Ethel Brunette

Richard Pryor

Pres. John F. Kennedy

William Jordan

Senator Joseph McCarthy

George D. Wallace

Senator Joseph McCarthy

George Wallace

Suydam

Henderson Forsythe

E.G. Marshall

Putnam

Fred J. Scollay

Dwight Webb Sr.

William Wellman Jr.

Benchley

Art Lund

Miss Bryant

Mary Alice Moore

Senator Kenneth McKellar

Jim Antonio

President's Aide

Gregg Abels

President's Advisor

Dan Resin

Reilly

James Dixon

Newscaster

Penny du Pont

Valet

Alvin Miles

Heywood Brown

John Bay

Earl Warren

Brooks Morton

The President

Richard M. Dixon

Frank

James Dukas

Hijacker

Ron Faber

FBI Agent

Sam Chew Jr.

FBI Agent

Paul Thomas

FBI Agent

Ken Harvey

FBI Agent

Jack Drummond

FBI Agent

Colin Bremner

FBI Agent

Dana Rowe

FBI Agent

Hanns Manship

FBI Agent

Ed Nast

Stewardess

Tanya Roberts

Stewardess

Margo Lynn Curtis

Kelly

Larry Pine

Harry Brunette

John Stefano

Ethel Brunette

Jennifer Lee Pryor

Mary Jo Kopechne (voice)

Gwyn Gilliss

Voice on Tape

Bruce Weitz

Louis Lepke

Gordon Zimmerman

Newspaper Man

Joe ArrowSmith