John "Jock" Kane (7 April 1921 – 27 September 2013) was a Scottish whistleblower who was prevented from publishing two books alleging corruption at the British intelligence agency Government Communications Headquarters (GCHQ). Kane served with the Royal Air Force in various European theatres as a radio operator in World War II, before joining GCHQ after the war. While serving with GCHQ in Hong Kong, Kane was concerned with the lack of security and after uncovering fraud, raised his complaints with officials. Kane retired in 1978 and his complaints were investigated by a senior civil servant, but the report was never published. Kane wrote a memoir in 1984, GCHQ: The Negative Asset, which was subsequently banned, as was a second memoir, The Hidden Depths of Treachery. Kane later worked as a