It's entitled KGB Archivist, Defector Vasili Mitrokhin, 81 and no, Mitrokhin was not a ballet dancer, however he was an archivist who apparently planned ahead because
Mr. Mitrokhin's handwritten notes were hidden in his shoes, buried in milk containers under the floorboards of his dacha or under his back garden and smuggled out of Russia by British agents in six trunks. The notes contained multiple revelations on the activities of the much-feared KGB for more than 70 years in the Soviet Union, Europe, Afghanistan and the United States...
If you haven't yet read the whole story, you really ought to - it's intriguing on many different levels.
The part of the article that makes reference to ballet is, as Alexandra already quoted in Links:
I have not yet read Plisetskaya's autobiography (I, Maya Plisetskaya) but I did note that she and Mitrokhin are both born within a year or so of each other...and I'd wager quite a bit that the two certainly knew each other later in life.
Well, now I have two more books on my "Must Read" list.
Anyone have any insights on this subject - the KGB and its "interest" in ballet dancers?
(The utter ineptitude of the CIA in the face of Mitrokhin's first attempt to defect is another theme, for a non ballet related board! )