I want to know the answer to the following question:
Who, in 1979, was discovered to be a communist spy?
All the background I'm provided with is that "The following year brought two blows: one was the unmasking of Anthony Blunt, former Surveyor of the Queen's Pictures, as a communist spy; the other was the assassination of her relative and in-law Lord Mountbatten by the Provisional Irish Republican Army.". Is that enough to answer the question?