The ABC Trial was a trial of charges under sections 1 and 2 of the Official Secrets Act 1911 trial in United Kingdom. It took place in 1978 and is named after the three defendants: Crispin Aubrey, John Berry and Duncan Campbell. Aubrey was a journalist for Time Out, John Berry was a former corporal in signals intelligence (SIGINT), and Duncan Campbell was an investigative journalist.
One of the prosecution witnesses was an anonymous SIGINT officer, referred to as Colonel B.
- 18 February 1977: Aubrey and Campbell (the two journalists) interviewed Berry
- 20 February 1977: All three men were arrested and charged under section 2 of the Official Secrets Act 1911 (Berry was charged with "communicating classiﬁed information to unauthorised persons", and Campbell and Aubrey with "unauthorised receipt of classified information")
- 24 May 1977: Further charges were added under section 1 of the Official Secrets Act
- 9 August 1977: Additional charge under section 1 against Duncan Campbell, for collecting information
- November 1977: Committal hearing at Tottenham Magistrates Court. First appearance of Colonel B as a prosecution witness.
- 5 September 1978: Trial opens at the Old Bailey in front of Mr Justice Willis
- 18 September 1978: Trial stopped after jury foreman exposed as a former SAS officer
- 3 October 1978: Second trial opens in front of Mr Justice Mars-Jones
- 24 October 1978: All section 1 charges dropped
- 17 November 1978: Aubrey, Berry and Campbell receive non-custodial sentences
- Duncan Campbell (30 September 2012). "Crispin Aubrey obituary | Environment | guardian.co.uk". London: Guardian. Retrieved 2012-10-02.
- Campbell, Duncan (1979). Official Secrecy and British Libertarianism
- Aubrey, Crispin (1981). Who's Watching You? Britain's Security Services & the Official Secrets Act (1st ed.). Penguin Books. ISBN 0-14-022283-9.
- Robertson, Geoffrey (1999). The Justice Game, Vintage Books. ISBN 0-09-958191-4
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