Giuseppi Martelli was found in possession of some alleged espionage equipment and was in contact with British public servants bound by the UK official Secrets Act.  In court his defense argued he was engaged in an entrapment scheme to expose Russian spies. He was acquitted.  https://adsabs.harvard.edu/full/1995QJRAS..36..459G See also " The Mitrokhin Archive "  " ingenious scheme '