Leonardo DiCaprio

John Edgar Hoover

Naomi Watts

Helen Gandy

Armie Hammer

Clyde Tolson

Josh Lucas

Charles Lindbergh

Josh Hamilton

Robert Irwin

Judi Dench

Anna Marie Hoover

Geoff Pierson

Mitchell Palmer

Gunner Wright

Dwight Eisenhower

Dermot Mulroney

Colonel Schwarzkopf

Kaitlyn Dever

Palmer's Daughter

Adam Driver

Walter Lyle

Ed Westwick

Agent Smith

Jessica Hecht

Emma Goldman

Denis O'Hare

Albert Osborne

Lea Thompson

Lela Rogers

Damon Herriman

Bruno Hauptmann

Sadie Calvano

Edgar's Niece

Amanda Schull

Anita Colby

Roberta Bassin

Roosevelt's Secretary

Emily Alyn Lind

Shirley Temple

Barbara Keegan

Bombing Witness

Gerald Downey

FBI Agent

Jeffrey Donovan

Robert Kennedy

Geoff Stults

Raymond Caffrey

Lea Coco

Agent Sisk

Aaron Lazar

Prosecutor Wilentz

David A. Cooper

Franklin Roosevelt

Kelly Lester

Head Secretary

Jack Donner

Edgar's Father

Jack Axelrod

Caminetti

Josh Stamberg

Agent Stokes

Christian Clemenson

Inspector Schell

Billy Smith

Secret Service Officer

Ken Howard

Harlan Fiske Stone

Zach Grenier

John Condon

Johnny Cicco

Young Agent

Steve Monroe

Restaurant Host

Stephen Root

Arthur Koehler

Gary Werntz

Attorney General

David Clennon

Senator Friendly

Michael O'Neill

Senator McKellar

Eric Frentzel

William Mahan

Kyle Eastwood

Stork Club Band

Gregory Hoyt

Agent One

Jenny Phagan

Baker's Wife

Leslie Augustine

Lindbergh Nanny (uncredited)

Fileena Bahris

Starlet (uncredited)

Belinda Gosbee

Gangster's Moll (uncredited)

Elizabeth Karr

Secretary (uncredited)

Martin Luther King Jr.

Self (archive footage) (uncredited)

Pat Nixon

Self (archive footage) (uncredited)

Richard Nixon

Self (archive footage) (uncredited)

Jamie Noel

Racetrack Gambler (uncredited)

Miles Fisher

Agent Garrison

Robert Fleet

Edgar's Mother's Doctor

Scot Carlisle

Agent Williams

Ryan McPartlin

Lawrence Richey