Doi-gumi henchmen on the march, 1949
The Doi-gumi was a Japanese yakuza family which was active in Hiroshima Prefecture during the 1940s and 1950s. Founded by Kiyoshi Doi, the family was based mostly in Kure, and it was initially allied with the Yamamori-gumi and the Okubo-gumi. In 1949, however, Okubo-gumi boss Kenichi Okubo arranged for Yoshio Yamamori to rig a municipal assembly vote against Doi's political ally Shoichi Kanamaru and his faction, leading to a war breaking out between the two families. Doi was assassinated at the headquarters of the Kaito-gumi on 16 October 1949, and the remnants of his family were nearly destroyed over the next few weeks. In 1954, Kanamaru arranged for the last remaining Doi loyalists to join forces with Uichi Shinkai's faction of the Yamamori-gumi in the fight against Tetsuya Sakai's majority faction, but Sakai's army of hitmen finished off the Doi-gumi and crushed the Shinkai-gumi as well.