George Peppard as Capt. Frank Matthews

Jean Seberg as Adele Matthews

Richard Kiley as Woodrow Wilson King

Charles McGraw as Deputy Chief John P. Hildebrand

Madeleine Sherwood as Mrs. Eileen Sanderson

Robert F. Lyons as Paul Martin Sanderson

Frank Marth as Lt. Smithson

Marj Dusay as Liz Tennant

Paul McGrath as Senator Augustus Cole

Stewart Moss as Richard D'Angelo

Isabel Sanford as Effie

Dana Elcar as Det. J.J. 'Red' Thornton

Harry Lewis as Brooks Elliott

Mildred Trares as Mary Schumacher

Robin Raymond as Myra

Phyllis Hill as Mrs. Wilma Elliot

S. John Launer as Judge Kinsella

Jock MacKelvie as U.S. Attorney Grady Butler

Richard Guizon as Deputy Marshall Jack Barnes

Jack Grimes as Artie

Logan Ramsey as Detective Jelinek

Douglas Henderson as Detective Hanauer

Gene Boland as Garland

Vince Flaherty as Street Tough

George Boyce as Courtroom Spectator