The Dojin-kai is a yakuza organization based in Kurume, Fukuoka, Japan, founded in 1971 by Isoji Koga. It is a designated boryokudan group with approximately 310 members, known for its militant nature and involvement in large-scale methamphetamine trafficking, which is traditionally shunned in the yakuza world. The group has been involved in violent conflicts, including the Yama-Michi War against the Yamaguchi-gumi, and is a member of the anti-Yamaguchi Yonsha-kai federation.
CRIMENET has extracted 18 linkages for this organization, including 6 cooperative ties across 4 organizations, 9 conflicts across 5 organizations, 3 other connections and footprints in 1 country.