“The “Mitrokhin Archive” is a collection of handwritten notes which were secretly made by the KGB archivist Vasili Mitrokhin during the thirty years in which he served as a KGB archivist in the foreign intelligence service and the First Chief Directorate. When he defected to the United Kingdom in 1992, he brought the archive with him, in six full trunks. His defection was not officially announced until 1999.
The official historian of MI5, Christopher Andrew, wrote two books, The Sword and the Shield (1999) and The World Was Going Our Way: The KGB and the Battle for the Third World (2005), based on material in the archives. The books purport to provide details about many of the Soviet Union‘s clandestine intelligence operations around the world.-Wikipedia contributors, “Mitrokhin Archive,” Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/w/index.php?title=Mitrokhin_Archive&oldid=1046370123 (accessed October 22, 2021).