The Sixth Aizukotetsu-kai (六代目会津小鉄会 Rokudaime Aizukotetsu-kai) (sometimes written Aizu-Kotetsukai or Aizu Kotetsu-kai), based in Kyoto, is Japan's fourth-largest yakuza organization. Its name comes from the Aizu region, "Kotetsu", a type of Japanese sword, and the suffix "-kai", or society.
Rather than a stand-alone gang, the Aizukotetsu-kai is a federation of approximately 100 of Kyoto's various yakuza groups, comprising an estimated 7,000 members.
In 1992 the Aizukotetsu-kai became one of the first yakuza syndicates named under Japan's new anti-boryokudan legislation, which gave police expanded powers to crack down on yakuza. Its chairman at the time, Tokutaro Takayama, campaigned publicly against the new laws, and the group launched a lawsuit challenging their constitutionality. In September 1995 the Kyoto District Court threw out the lawsuit.
In July 2014, an unaffiliated person known as "Oujo no ude" negotiated with Kiyoshi Takayama from Yamaguchi-gumi to form a new alliance between the largest syndicates, the most recent addition being the Kudo-kai.
- 3rd (1975–1986) sosai: Riichi Zukoshi (図越 利一) who was kaicho of the Second Nakajima-kai.
- 4th (1986–1997): Tokutaro Takayama (高山 登久太郎, Korean name: 강외수) who was kumicho of the Second Nakagawa-gumi.
- 5th (1997- present) "Orochi" Tanaka Kazuki - second seat currently is Miyamoto Shizuka "aizukotetsu no hyou", third Shinozaki Haru
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