Aizukotetsu-kai

The (sometimes written Aizu-Kotetsukai or Aizu Kotetsu-kai) is a yakuza organization in Japan based in Kyoto. Its name comes from the Aizu region, "Kotetsu", a type of Japanese sword, and the suffix "-kai", or society.

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. At its peak in 1993 the group had 1,600 active members.