Columbia subject headings:
Espionage, Soviet--United States.
Subversive activities--United States.
United Nations--Soviet Union.
United States. Federal Bureau of Investigation.
Harvard subject headings:
Espionage, Soviet--United States.
Subversive activities--United States
United Nations--Soviet Union.
United States. Federal Bureau of Investigation
Princeton subject headings:
Espionage, Soviet--United States.
Subversive activities--United States.
United Nations--Soviet Union.
United States. Federal Bureau of Investigation