John Edgar Hoover
Leonardo DiCaprio
Helen Gandy
Naomi Watts
Walter Lyle
Adam Driver
Agent Smith
Ed Westwick
Emma Goldman
Jessica Hecht
Albert Osborne
Denis O'Hare
Lela Rogers
Lea Thompson
Bruno Hauptmann
Damon Herriman
Edgar's Niece
Sadie Calvano
Anita Colby
Amanda Schull
Roosevelt's Secretary
Roberta Bassin
Shirley Temple
Emily Alyn Lind
Clyde Tolson
Armie Hammer
Bombing Witness
Barbara Keegan
FBI Agent
Gerald Downey
Robert Kennedy
Jeffrey Donovan
Raymond Caffrey
Geoff Stults
Young Boy
Thomas Langston
Agent Sisk
Lea Coco
Prosecutor Wilentz
Aaron Lazar
Palmer's Wife
Cheryl Lawson
Inspector
Brady Matthews
Franklin Roosevelt
David A. Cooper
Charles Lindbergh
Josh Lucas
Head Secretary
Kelly Lester
Edgar's Father
Jack Donner
Hoover as a Child
Dylan Burns
Caminetti
Jack Axelrod
Bureau Agent (1919)
Michael James Faradie
Agent Stokes
Josh Stamberg
Inspector Schell
Christian Clemenson
Secret Service Officer
Billy Smith
Harlan Fiske Stone
Ken Howard
John Condon
Zach Grenier
Robert Irwin
Josh Hamilton
Young Agent
Johnny Cicco
Restaurant Host
Steve Monroe
Arthur Koehler
Stephen Root
Attorney General
Gary Werntz
Senator Friendly
David Clennon
Senator McKellar
Michael O'Neill
Fred Hunter
Eric Larkin
William Mahan
Eric Frentzel
Stork Club Band
Kyle Eastwood
Agent One
Gregory Hoyt
Anna Marie Hoover
Judi Dench
Baker's Wife
Jenny Phagan
Bronx Baker
Chris Caputo
African American Woman (as Shannon McClain)
Shannon McClain Robertson
Lindbergh Nanny (uncredited)
Leslie Augustine
Starlet (uncredited)
Fileena Bahris
Lucille Ball (uncredited)
Jennipher Foster
Gangster's Moll (uncredited)
Belinda Gosbee
Secretary (uncredited)
Elizabeth Karr
Self (archive footage) (uncredited)
Martin Luther King Jr.
Hollywood Starlet (uncredited)
Lindsay Lucas-Bartlett
Mitchell Palmer
Geoff Pierson
Pat Nixon
Richard Nixon
Racetrack Gambler (uncredited)
Jamie Noel
Agent Garrison
Miles Fisher
Edgar's Mother's Doctor
Robert Fleet
Radical Citizen (uncredited)
Emily Banks
Agent Williams
Scot Carlisle
Lawrence Richey
Ryan McPartlin
Dwight Eisenhower
Gunner Wright
Colonel Schwarzkopf
Dermot Mulroney
Palmer's Daughter
Kaitlyn Dever
Director of Photography
Tom Stern
Producer
Robert Lorenz
Brian Grazer
Casting
Fiona Weir
Clint Eastwood
Director
Original Music Composer
Stunt Coordinator
Buddy Van Horn
Writer
Dustin Lance Black
Stunts
Chuck Waters
Matthew R. Anderson
Justin Gant
Executive Producer
Erica Huggins
Editor
Joel Cox
Gary D. Roach
Tim Moore
Costume Design
Deborah Hopper
Assistant Sound Editor
Kevin Murray
Brian Avery
Sound Re-Recording Mixer
Gregg Rudloff
Set Decoration
Gary Fettis
Production Design
James J. Murakami
Jacob Chambers
Art Direction
Patrick M. Sullivan
Greg Berry