The Dojin-kai is a Japanese yakuza organization based in Fukuoka. Founded in Kurume in 1971, the group has been noted for its aggressive and violent nature, as have the Kudo-kai and Taishu-kai. The Dojin-kai was isolated within the yakuza world as a result of the Yama-Michi War against the Yamaguchi-gumi and another conflict with the Sumiyoshi-kai in 1983, and it most infamously warred with the Kyushu Seido-kai from 2006 to 2011. The group was known for its strong anti-authority, anti-police stance, and it came to have around 760 members, who took part in large-scale drug trafficking.