Duncan Campbell is a correspondent for The Guardian. The Guardian is a British newspaper owned by the Guardian Media Group. ...

He should not be, but often is, confused with the other Duncan Campbell who is best known for his work on Signals Intelligence. Duncan Campbell is a freelance investigative journalist and television producer who has specialised in intelligence issues, was prosecuted under the Official Secrets Act in the ABC Trial in 1978 and made the controversial series Secret Society for the BBC in 1987 (see Zircon affair). ... SIGINT stands for SIGnals INTelligence, which is intelligence-gathering by interception of signals, whether by radio interception or other means. ...