David Shayler
![Shayler in 2005](/Images/godic/202502/10/David_Shayler_Axis_for_Peace_2005-11-183148.jpg")
![David Shayler talking at an anti-war meeting at Sheffield University](/Images/godic/202502/10/David_Shayler3148.jpg")
David Shayler (born 24 December 1965) is a British journalist and former MI5 officer. Shayler was prosecuted under the Official Secrets Act 1989 for 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.