Columbia subject headings:
Strikes and lockouts--Police--United States--Case studies.
Strikes and lockouts--Police--United States.
Harvard subject headings:
Strikes and lockouts--Police--United States--Case studies.
Strikes and lockouts--Police--United States.
Princeton subject headings:
Case studies.
Strikes and lockouts--Police--United States--Case studies.
Strikes and lockouts--Police--United States.