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Farewell Dossier was a counter-intelligence operation of CIA that amounted to slipping a Trojan horse into software planted to be stolen by spies of the Soviet Union. This eventually resulted in the sabotage and blast of the Trans-Siberian gas pipeline, compared to a 3-kiloton bomb.
The details of the operation were declassified in 1996 and are publicly available from the CIA, see the external link.