This sounds alot like Sergei and Yulia Skripal.
https://www.cia.gov/library/readingroom/docs/CIA-RDP75-00001R000100050063-3.pdf
http://www.foxnews.com/world/2018/03/07/uk-authorities-to-reveal-more-in-russian-ex-spy-case.html
The Cambridge Spy Ring was a ring of spies in the United Kingdom, who passed information to the Soviet Union during World War II and was active at least into the early 1950s. None were ever prosecuted for spying. The number and membership of the ring emerged slowly from the 1950s onwards. As far as the general public was concerned, this started with the sudden flight of Donald Duart Maclean (cryptonym: Homer) and Guy Burgess (cryptonym: Hicks) to Russia in 1951. Suspicion immediately fell on Kim Philby (cryptonym: Stanley), but he did not follow them until 1963. Anthony Blunt (cryptonyms: Tony, Johnson) and John Cairncross (cryptonym: Liszt) confessed to British intelligence but this remained secret for many years, until 1979 in the case of Blunt. It therefore took several years for the usual modern name to evolve through the Cambridge Four to the Cambridge Five. In the innermost circles of the KGB, they were supposedly known as the "Magnificent Five".
https://en.wikipedia.org/wiki/Cambridge_Five
https://www.cia.gov/library/readingroom/docs/CIA-RDP90-00552R000404050008-2.pdf