Columbia subject headings:
Harvard subject headings:
Espionage, Soviet--Great Britain--History--20th century.
Espionage, Soviet--United States--History--20th century.
Fuchs, Klaus Emil Julius, 1911-1988
Nuclear weapons--Political aspects--Great Britain.
Nuclear weapons--Political aspects--United States.
Spies--Soviet Union--Biography.
Princeton subject headings:
Communists--Germany (East)--Biography.
Espionage--Great Britain--History--20th century.
Espionage--United States--History--20th century.
Fuchs, Klaus Emil Julius, 1911-1988.
Spies--Soviet Union--Biography.
Spies--United States--Biography.