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Yamaguchi-gumi ( Japanese: 山口組) has been known as Japan's largest boryokudan (analogous to a western Mafia family). Estimates put the number of active members at 20,000, with another 15,000 people having strong associations. It is, by far, the largest of the yakuza groups, and its membership encompasses roughly a third of all yakuza. The Yamaguchi-gumi has its headquarters in Kobe, Japan, but it operates all across Japan, and also has overseas operations in Asia and the United States.Leadership
- 1st (1915-1925) Kumicho: Yamaguchi Harukichi
- 2nd (1925-1942) Kumicho: Yamaguchi Noboru - son of Yamaguchi Harukichi
- 3rd (1946-1981) Kumicho: Taoka Kazuo
- 4th (1984-1985) Kumicho: Takenaka Masahisa
- 5th (1989-) Kumicho: Watanabe Yoshinori
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