Some articles on kyokuryu:

Kyokuryū-kai - History
... The Kyokuryu-kai was formed in 1970 as the Okinawa-rengo Kyokuryu-kai (沖縄連合旭琉会, Okinawa-rengō Kyokuryū-kai?, lit ... "Okinawa-Union Kyokuryu-Group") by two gang groups, the Naha Clan and the Koza Clan ... From 1973 to 1981, the Kyokuryu-kai was in fierce conflict with the Yamaguchi-gumi, the largest known yakuza syndicate attempting to expand its influence into Okinawa at ...