Columbia subject headings:
Eavesdropping--United States--Congresses.
Electronic surveillance--United States--Congresses.
Wiretapping--United States--Congresses.
Harvard subject headings:
Eavesdropping--United States--Congresses.
Electronic surveillance--United States--Congresses.
Wiretapping--United States--Congresses.
Princeton subject headings:
Eavesdropping--United States--Congresses.
Electronic surveillance--United States--Congresses.
Wiretapping--United States--Congresses.