Miss Werner fled from Britain when Klaus Fuchs was arrested in 1950, and settled in East Berlin.

ECONOMIST: Ruth Werner, Soviet spy, died on July 7th, aged 93

In 1911, Emil Julius Klaus Fuchs, German physicist who settled in Britain and spied for the Soviet Union, was born.

CNN: Monday,

The documents started the hunt for spies such as Kim Philby, a British foreign-policy adviser, and Klaus Fuchs, a scientist passing on technical details about the atom bomb to the Soviet Union.

ECONOMIST: Svetlana Gouzenko

The Soviets' knowledge from 1941 that the western allies were pursuing the bomb, and the receipt of detailed scientific and technological information from top scientists such as Klaus Fuchs, must have speeded up the development of their own nuclear weapons.

ECONOMIST: History of espionage: Dark secrets | The