Columbia subject headings:
Cold War.
Intelligence service--Great Britain--History--20th century.
Intelligence service--United States--History--20th century.
Harvard subject headings:
Cold War.
Great Britain. MI6.
Intelligence service--Great Britain--History--20th century.
Intelligence service--History--20th century.
Intelligence service--United States--History--20th century
United States. Central Intelligence Agency
Princeton subject headings:
Cold War.
Intelligence service--Great Britain--History--20th century.
Intelligence service--United States--History--20th century.