It was from a nondescript detached home in Ruislip that a respectable couple helped to feed Britain's nuclear secrets to Moscow. Until they were caught along with their co-conspirators in 1961, Morris and Lena Cohen were known by their neighbours to be respectable antiquarian book dealers Peter and Lena Kroger. With the help of Soviet spy Gordon Lonsdale, Navy clerk Harry Houghton and secretary Ethel Gee, the couple's activities in the spy ring helped the Soviet Union to build its own silent nuclear submarines more quickly.
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