Billion Dollar Brain (Harry Palmer) (1967)

Directed by Ken Russell, Billion Dollar Brain (1967) stars Michael Caine, Karl Malden, Ed Begley and Françoise Dorléac. Based on the book by Len Deighton, the film follows former intelligence agent Harry Palmer as he becomes entangled in a conspiracy involving a wealthy anti-communist businessman, a private army and a sophisticated supercomputer. Combining espionage, Cold War intrigue and political tension, the story takes Palmer from Finland to Latvia and Texas as he uncovers a dangerous plan that could reshape the balance of power

Från IMDB:
British spy-turned-detective Harry Palmer stumbles upon an oil tycoon's plot to overthrow Communism using a supercomputer.