Columbia subject headings:
Internal security--United States.
Nuclear energy--Political aspects--United States.
Scientists--United States.
United States. Congresses.
Harvard subject headings:
Internal security--United States
Nuclear energy--Political aspects--United States.
Scientists--United States
United States. Congress.
Princeton subject headings:
Internal security--United States.
Loyalty oaths--United States.
Nuclear energy--Political aspects--United States.
Scientists--United States.
Security clearances--United States.
United States. Congress