a private intelligence organization which specializes in espionage including police-targeted intelligence. According to Japanese media sources, the organization is among the most profitable of all the Yakuza factions in Japan. Kodo-kai reportedly raked in an immense amount of money by being the sole supplier of rock, sand, and gravel for the Chūbu Centrair International Airport construction project. The organization continues to earn large revenue by controlling the stevedoring and warehousing companies at the Port of Nagoya, and having a monopoly on sex-oriented establishments in the Nagoya area. Affiliates The Kodo-kai's known branch organizations have included : Seibu Rengo, based in Hakata, Fukuoka, Kyushu. Komatsu-gumi, based in Tokyo. Launched around 1987, Komatsu-gumi have its offices in several districts in Tokyo, including Taito and Minato. Koike-gumi, based in Chiba. Fukushima Rengo, based in Sapporo, Hokkaido. Jido-kai, based in Nagano, Nagano, the largest Kodo affiliate in Nagano Prefecture. Omi-ikka, based in Otsu, Shiga. The Omi-ikka was founded in 2003 by the eldest son of Tokutaro Takayama, the fourth president of the Kyoto-based Aizukotetsu-kai. among others. References Organizations established in 1984 Organizations designated as terrorist 1984 establishments in Japan Yakuza groups Yamaguchi-gumi