There are twenty-two officially recognized yakuza groups in Japan. The big three are the Sumiyoshi-kai, with 12,000 members; the Inagawa-kai, with 10,000 members; and at the top the Yamaguchi-gumi. There are 40,000 members of the Yamaguchi-gumi and more than a hundred subgroups. Each group is required to pay monthly dues, which are funneled to the top of the organization. In essence, every month the Yamaguchi-gumi headquarters takes in (at a conservative estimate) more than $50 million in private equity.
