One political secret was how Fuchs' spying was discovered in the first place. We now know that in 1949, when American government cryptographers decoded some messages sent from the Soviet embassy in New York to Moscow during World War II, they came upon a report by Fuchs on work being done at Los Alamos. To conceal from the Soviet Union that their codes had been deciphered, the American and British security services sought to have Fuchs confess to his actions. The result was the series of interviews with Skardon and Perrin. The breaking of Soviet codes was never mentioned during the prosecution of the case and remained a government secret for decades.
Another political secret was that Fuchs was known to be a communist even before he arrived in England as a refugee from Nazi Germany in 1933. From a Gestapo report and from information provided by a German agent ...
