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A picture of Cambridge educated Russian spy Donald MacLean, associated with a group of Cambridge Univerty spies including Guy Burgess, Kim Philby, John Cairncross and Anthony Blunt, pictured with his two sons (Photo by Popperfoto/Getty Images)

A picture of Cambridge educated Russian spy Donald MacLean, associated with a group of Cambridge Univerty spies including Guy Burgess, Kim Philby, John Cairncross and Anthony Blunt, pictured with his two sons  (Photo by Popperfoto/Getty Images)