山本博
It was formed on June 13, 1984 when Hiroshi Yamamoto, a top lieutenant in the Yamaguchi-gumi, broke from that gang to form his own organization with over 10,000 members. The split stemmed from professional jealousy: Yamamoto had been seen as a contender for the role of "kumicho", or Godfather, in the Yamaguchi-gumi, and was enraged when a rival, Masahisa Takenaka, was chosen.