Van Heflin as Fred Staples

Everett Sloane as Walter Ramsey

Ed Begley as Bill Briggs

Beatrice Straight as Nancy Staples

Elizabeth Wilson as Marge Fleming

Joanna Roos as Margaret Lanier

Valerie Cossart as Martha Stevens

Eleni Kiamos as Sylvia Trammel

Ronnie Welsh as Paul Briggs

Shirley Standlee as Miss Hill

Andrew Duggan as Harvey Jameson

Jack Livesey as D.J. Vandeventer

John Seymour as Ed Gordon

Sally Gracie as Ann

Sally Chamberlin as Mrs. Jameson

Edward Binns as Elevator Starter

James Kelly as Jim Latham

John Shelly as Edgar Grannigan

Victor Harrison as Carl Portier

Ethel Britton as Woman (uncredited)

Michael Dreyfuss as Billy (uncredited)

Elaine Kaye as Second Secretary (uncredited)

Adrienne Moore as First Secretary (uncredited)