Columbia subject headings:
Gun control--United States.
Illegal arms transfers--United States--Prevention.
Law enforcement--United States.
Harvard subject headings:
Firearms industry and trade--United States.
Firearms ownership--United States
Gun control--United States
Illegal arms transfers--United States--Prevention.
Law enforcement--United States
Princeton subject headings:
Firearms industry and trade--United States.
Firearms ownership--United States.
Gun control--United States.
Illegal arms transfers--United States--Prevention.
Law enforcement--United States.