Columbia subject headings:
Crime--Japan--History.
Gangs--Japan--History.
Organized crime--Japan--History.
Yakuza--History.
Yakuza--Japan--History.
Harvard subject headings:
Crime--Japan--History
Gangs--Japan--History.
Organized crime--Japan--History.
Yakuza--History.
Yakuza--Japan--History.
Princeton subject headings:
Crime--Japan--History.
Gangs--Japan--History.
Organized crime--Japan--History.
Yakuza--History.
Yakuza--Japan--History.