On this day, 75 years ago, March 1, 1950 (January 13, 1950 in the lunar calendar), Fuchs was sentenced to 14 years in prison for leaking nuclear secrets. March 1, 1950. British Dr. Jekyll and Mr. Hyde Klaus Fuchs were sentenced to 14 years in prison in London for leaking the atomic bomb, the most important strategic secret of our time, to the Soviet Union. The well-known scientist, who is a combination of loyalty and rape, has pleaded guilty to espionage and was found guilty of violating confidentiality laws. Fuchs has never concealed his political activities and has been engaged in atomic bomb research since 1943. Fuchs left Nazi Germany in 1933 for France and then Britain. In 1942 he swore loyalty to Britain and began working at Howell, the British Atomic Energy Research Center. Here he had access to classified intelligence and provided it to the Soviet Union.