Editing Klaus Fuchs (section)

==Career in East Germany==
On arrival at [[Berlin Schönefeld Airport]] in the GDR, Fuchs was met by [[Grete Keilson|Margarete "Grete" Keilson]], a friend from his years as a student communist. They were married on 9 September 1959.{{sfn|Rossiter|2014|pp=311–313}}

In the GDR, Fuchs continued his scientific career and achieved considerable prominence as a leader of research. He became a member of the [[Socialist Unity Party of Germany|SED]] [[central committee]] in 1967, and in 1972 was elected to the [[German Academy of Natural Scientists Leopoldina|Academy of Sciences]] where from 1974 to 1978 he was the head of the research area of physics, nuclear and materials science; he was then appointed deputy director of the [[Helmholtz-Zentrum Dresden-Rossendorf|Central Institute for Nuclear Physics]] in Rossendorf, [[Dresden]], where he served until he retired in 1979. From 1984, Fuchs was head of the scientific councils for energetic basic research and for fundamentals of microelectronics. He received the [[Patriotic Order of Merit]], the [[Order of Karl Marx]] and the [[National Prize of East Germany]].{{sfn|Laucht|2012|p=175}}
[[File:Berlin Friedrichsfelde Zentralfriedhof, Pergolenweg - Fuchs.jpg|thumb|right|upright|The grave of Klaus Fuchs and his wife Margarete in Berlin]]

In ''The Nuclear Express: A Political History of the Bomb and Its Proliferation'' (2009) by [[Thomas C. Reed|Thomas Reed]] and Daniel Stillman, it is argued that a tutorial Fuchs gave to [[Qian Sanqiang]] and other Chinese physicists helped them to develop the first [[People's Republic of China and weapons of mass destruction|Chinese atomic bomb]], the [[596 (nuclear test)|''596'']], which was tested five years later.{{sfn|Reed|2008|pp=52–53}} Three historians of nuclear weapons history, Robert S. Norris, [[Jeremy Bernstein]], and [[Peter D. Zimmerman]], challenged this particular assertion as "unsubstantiated conjecture"{{sfn|Norris|Bernstein|Zimmerman|2009|p=296}} and asserted that ''The Nuclear Express'' is "an ambitious but deeply flawed book".{{sfn|Norris|Bernstein|Zimmerman|2009|p=293}}