David Shayler (born 24 December 1965) is a British journalist and former MI5 (Security Service) officer. Shayler earned notoriety after being prosecuted under the Official Secrets Act 1989 for his passing secret documents to the Mail on Sunday in August 1997 that alleged that MI5 was paranoid about socialists, and that it had previously investigated Labour Party ministers Peter Mandelson, Jack Straw and Harriet Harman.
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