Columbia subject headings:
Harvard subject headings:
Communism--Japan--History--Sources.
Internal security--Japan--History--Sources.
Japan. Keishichō. Tokubetsu Kōtō Keisatsubu.
Political crimes and offenses--Japan
Princeton subject headings:
Communism--Japan--Sources.
Internal security--Japan--Sources.
Japan--Colonies--East Asia--Administration.
Japan. Keichichō. Tokubetsu Kōtō Keisatsubu.
Labor unions--Japan--Sources.
Nationalism--Japan--Societies, etc.
Political crimes and offenses--Japan.