ABC trial

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.

The trial before Mr Justice Thesiger, which was already controversial, achieved greater notoriety when the Government attempted to introduce testimony from three anonymous SIGINT officers, who were successively referred to as Colonel A, Colonel B, and Mr. C.

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