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Klaus Emil Julius Fuchs (29 December 1911 – 28 January 1988) was a German theoretical physicist and atomic spy who supplied information from the American, British, and Canadian Manhattan Project to the Soviet Union during and shortly after World War II. While at the Los Alamos Laboratory, Fuchs was responsible for many significant theoretical calculations relating to the first nuclear weapons and, later, early models of the hydrogen bomb. After his conviction in 1950, he served nine years in prison in the United Kingdom, then migrated to East Germany where he resumed his career as a physicist and scientific leader. The son of a Lutheran pastor, Fuchs attended the University of Leipzig, where his father was a professor of theology, and became involved in student politics, joining the student branch of the Social Democratic Party of Germany (SPD), and the Reichsbanner Schwarz-Rot-Gold, the SPD's paramilitary organisation. He was expelled from the SPD in 1932, and joined the Communist Party of Germany (KPD). He went into hiding after the 1933 Reichstag fire and the subsequent persecution of communists in Nazi Germany, and fled to the United Kingdom, where he received his PhD from the University of Bristol under the supervision of Nevill Francis Mott, and his DSc from the University of Edinburgh, where he worked as an assistant to Max Born. After the Second World War broke out in Europe, he was interned in the Isle of Man, and later in Canada. After he returned to Britain in 1941, he became an assistant to Rudolf Peierls, working on "Tube Alloys"—the British atomic bomb project. He began passing information on the project to the Soviet Union through Ursula Kuczynski, codenamed "Sonya", a German communist and a major in Soviet military intelligence who had worked with Richard Sorge's spy ring in the Far East. In 1943, Fuchs and Peierls went to Columbia University, in New York City, to work on the Manhattan Project. In August 1944, Fuchs joined the Theoretical Physics Division at the Los Alamos Laboratory, working under Hans Bethe. His chief area of expertise was the problem of implosion, necessary for the development of the plutonium bomb. After the war, he returned to the UK and worked at the Atomic Energy Research Establishment at Harwell as head of the Theoretical Physics Division. In January 1950, Fuchs confessed that he had passed information to the Soviets over a seven-year period beginning in 1942. A British court sentenced him to fourteen years' imprisonment and he was subsequently stripped of his British citizenship. He was released in 1959, after serving nine years, and migrated to the German Democratic Republic (East Germany), where he was elected to the Academy of Sciences and became a member of the Socialist Unity Party of Germany (SED) central committee. He was later appointed deputy director of the Central Institute for Nuclear Physics in Dresden, where he served until he retired in 1979. Early life Klaus Emil Julius Fuchs was born in Rüsselsheim, Grand Duchy of Hesse, on 29 December 1911, the third of four children of a Lutheran pastor, Emil Fuchs, and his wife Else Wagner. His father served in the army during World War I but later became a pacifist and a socialist, joining the Social Democratic Party of Germany (SPD) in 1921. He eventually became a Quaker. Fuchs had an older brother Gerhard, an older sister Elisabeth, and a younger sister, Kristel. The family moved to Eisenach, where Fuchs attended the Martin-Luther Gymnasium, and took his Abitur. At school, Fuchs and his siblings were taunted over his father's unpopular socialist political views, which they came to share. They became known as the "red foxes", Fuchs being the German word for fox. Fuchs was left-handed, but was forced to write with his right hand. Fuchs entered the University of Leipzig in 1930, where his father was a professor of theology. He became involved in student politics, joining the student branch of the SPD, a party that his father had joined in 1912, and the Reichsbanner Schwarz-Rot-Gold, the party's paramilitary organisation. His father took up a new position as professor of religion at the Pedagogical Academy in Kiel, and in the autumn Fuchs transferred to the University of Kiel, which his brother Gerhard and sister Elisabeth also attended. Fuchs continued his studies in mathematics and physics at the university. In October 1931, his mother committed suicide by drinking hydrochloric acid. The family later discovered that his maternal grandmother had also taken her own life. In the March 1932 German presidential election, the SPD supported Paul von Hindenburg for President, fearing that a split vote would hand the job to the Nazi Party (NSDAP) candidate, Adolf Hitler. However, when the Communist Party of Germany (KPD) ran its own candidate, Ernst Thälmann, Fuchs offered to speak for him, and was expelled from the SPD. That year Fuchs and all three of his siblings joined the KPD. Fuchs and his brother Gerhard were active speakers at public meetings, and occasionally attempted to disrupt NSDAP gatherings. At one such gathering, Fuchs was beaten up and thrown into a river. When Hitler became Chancellor of Germany in January 1933, Fuchs decided to leave Kiel, where the NSDAP was particularly strong and he was a well-known KPD member. He enrolled at the Kaiser Wilhelm Institute for Physics in Berlin. On 28 February, while on a train to Berlin for a secret KPD meeting, he read a newspaper article on the Reichstag fire. Fuchs correctly assumed that opposition parties would be blamed for the fire, and surreptitiously removed his hammer and sickle lapel pin. Fellow party members urged him to continue his studies in another country. He went into hiding for five months in the apartment of a fellow party member. In August 1933, he attended an anti-fascist conference in Paris chaired by Henri Barbusse, where he met an English couple, Ronald and Jessie Gunn, who invited him to stay with them in Clapton, Somerset. He was expelled from the Kaiser Wilhelm Institute in October 1933. Refugee in Britain Fuchs arrived in England on 24 September 1933. Jessie Gunn was a member of the Wills family, the heirs to Imperial Tobacco and benefactors of the University of Bristol. She arranged for Fuchs to meet Nevill Francis Mott, Bristol's professor of physics, and he agreed to take Fuchs on as a research assistant. Fuchs earned his PhD in physics there in 1937. A paper on "A Quantum Mechanical Calculation of the Elastic Constants of Monovalent Metals" was published in the Proceedings of the Royal Society in 1936. By this time, Mott had a number of German refugees working for him, and lacked positions for them all. He did not think that Fuchs would make much of a teacher, so he arranged a research post for Fuchs, at the University of Edinburgh working under Max Born, who was himself a German refugee. Fuchs published papers with Born on "The Statistical Mechanics of Condensing Systems" and "On Fluc.... Discover the Mike Rossiter popular books. Find the top 100 most popular Mike Rossiter books.