Columbia subject headings:
Demonstrations--Japan--History.
Internal security--Japan--History.
Japan--History--Allied occupation, 1945-1952.
Koreans--Japan--Political activity--History.
Local government--Law and legislation--Japan--History.
Harvard subject headings:
Internal security--Japan--History
Koreans--Japan--Political activity--History.
Labor movement--Japan--Political activity--History.
Labor--Japan--Political activity--History.
Working class--Political activity--Japan--History.
Princeton subject headings:
Internal security--Japan--History.
Koreans in Japan--Political activity--History.
Working class--Political activity--Japan--History.