Nuclear physicist Klaus Fuchs, a graduate of the University of Edinburgh in 1942, was jailed for imparting top secret information to Russia.
Fuchs, who was unmasked in 1950, was thought to have secured enough information during his time in the UK to advance Soviet atomic weapons by up to five years. The revelation of his true aims also led to the execution and arrest of others.
Born in the Frankfurt suburbs in December 1911, Klaus was the son of a theology professor and part of a family who were opposed to Nazi regime. He inherited these beliefs, and worked in the anti-Nazi movement for two years before being forced to flee to France.
