Three former heads of MI5 chart the changing face of spying. In exclusive interviews with the BBC's Security Correspondent Gordon Corera, they show how MI5 changed from chasing Cold War subversives to hunting down terrorists.
Three former heads of MI5 chart the changing face of spying. In exclusive interviews with the BBC's Security Correspondent Gordon Corera, they show how MI5 changed from chasing Cold War subversives to hunting down terrorists.
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