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Despite the fact that during the Second World War, the United States and the USSR were allies, each State has ceased to constantly spy on each other. Special attention should be operation "Confession", in which the Soviet Union for seven years led a "wiretap" straight from the American ambassador's office.
Starting from 1930, the NKVD to develop new instruments and methods for espionage. In 1943, the Soviet inventor and musician Lev Theremin, while in prison, invented a resonant cavity "Chrysostom" - listening device without batteries, which transmit information at the expense of high-frequency technology resonance. Stalin personally asked Theremin to invent a compact device for surveillance.
It is one thing to develop, and the other - the introduction. Preference was given to the passions of the American ambassador Averell Harriman to wooden products. To this end it was made of the coat of arms of the United States a few rare types of wood. Inside emblem artfully concealed "Chrysostom". Experiments have shown that the device is working effectively, the case remained for small.
From 4 to 11 February was held in Yalta, the famous Yalta Conference, which brought together the heads of the member states of anti-Hitler coalition. February 8 Soviet Foreign Minister Molotov Vyacheslov gave Roosevelt an invitation to visit the camp "Artek". Stalin and Beria understood that naturally Roosevelt because of their employment will not go anywhere, and will send pioneers Plenipotentiary of the United States Averell Harriman.
The next day at the camp came to a cottage high-ranking US politicians and bureaucrats. The final stage of the meeting was the performance of the pioneers of the American national anthem in English. To the sound of applause, the children handed Harriman same "Trojan" emblem. Everything went according to plan and the product with the "bug" is really hung in the office of the American ambassador in Moscow. Thus began a covert operation "Confessions."
Of two adjacent buildings evicted tenants, and settled in their apartments NKVD agents and technicians, who led continuously "wiretap." According Novate.ru, self coat of arms was examined several times by American experts, but listening device has not been detected during the seven years. It is noteworthy that during this time had replaced four American ambassador. Each of them is changing dramatically cabinet interior: from furniture to flooring, but the coat of arms has always continued to hang over the table Ambassador.
But all the secret sooner or later becomes apparent. Moreover, Americans have repeatedly stated about the leakage of information, but no one could figure out where it goes. Perhaps the "bug" has over the years would have remained unnoticed if "Chrysostom" does not passed the Americans recruited by the CIA Soviet GRU Colonel Pyotr Popov.
For a long time, the Americans were trying to understand the principle of Lev Theremin device. For these purposes were hired leading specialists in the field of radio engineering of the time. Some time later in the field of espionage inventor Peter Wright was still able to solve the riddle work "Chrysostom", which lay in the thin film membrane, vibrating from the impact of sound waves. Only in 1960 the Americans for the first time publicly demonstrated a "Trojan" coat of arms at the meeting of the UN Security committee.
Like this? Then read about how archive of declassified CIA recently published photos of spies in the Soviet military parades.
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A source: https://novate.ru/blogs/210219/49545/