Columbia subject headings:
Organized crime--Japan--Prevention.
Organized crime--Law and legislation--Japan.
Yakuza--Economic aspects--Japan.
Yakuza--Government policy--Japan.
Yakuza--Japan--History.
Harvard subject headings:
Organized crime--Japan--Prevention.
Organized crime--Law and legislation--Japan.
Yakuza--Economic aspects--Japan.
Yakuza--Government policy--Japan.
Yakuza--Japan--History.
Princeton subject headings:
Organized crime--Japan--Prevention.
Organized crime--Law and legislation--Japan.
Yakuza--Economic aspects--Japan.
Yakuza--Government policy--Japan.
Yakuza--Japan--History.