Klaus Fuchs, atom spy

the long version

"The 1950 espionage case of Klaus Fuchs, who betrayed British and American atomic secrets to the soviet Union, touched off a witch hunt in the United States that led to the capture of the Rosenbergs and many other alleged spies. The case fueled the fires of national concern over communism, Soviet espionage, internal subversion, and security in the nuclear age. Robert C. Williams has tenaciously retraced Fuchs's personal story but has also established that his espionage was part of a much larger Soviet effort to penetrate and control British intelligence."--Book Jacket.