Columbia subject headings:
Harvard subject headings:
Internal security--Japan--History
Japan. Keishichō. Tokubetsu Kōtō Keisatsubu--History.
Socialism--Japan--History
Princeton subject headings:
Internal security--Japan--History.
Japan. Keishichō. Tokubetsu Kōtō Keisatsubu--History.
Socialism--Japan--History.