Question: When was the British Labour politician Which was one of those investigated by David Shayler born? 
Sentence (from "David Shayler"): 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.
Relevant evidence: Yes