Bullitt

Bullitt is a movie starring Steve McQueen, Jacqueline Bisset, and Robert Vaughn. An all-guts, no-glory San Francisco cop becomes determined to find the underworld kingpin that killed the witness in his protection.
Senator Walter Chalmers is aiming to take down mob boss Pete Ross with the help of testimony from the criminal's hothead brother Johnny, who is in protective custody in San Francisco under the watch of police lieutenant Frank Bullitt. When a pair of mob hitmen enter the scene, Bullitt follows their trail through a maze of complications and double-crosses. This thriller includes one of the most famous car chases ever filmed.