Yoshio Kodama was a Japanese right-wing ultranationalist, Imperial Japanese Navy rear admiral and a prominent figure in the rise of organized crime in Japan. The most famous kuromaku, or behind-the-scenes power broker, of the 20th century, he was active in Japan's political arena and criminal underworld from the 1930s to the 1970s, and became enormously wealthy through his involvement in smuggling operations.
Yoshio Kodama (first row, second from right) at a meeting of the ultranationalist Black Ocean Society (Genyōsha) in 1929
Kodama in January 1953 during a visit by conservative politicians Ichirō Hatoyama and Bukichi Miki to his Tokyo estate. Hatoyama became Prime Minister of Japan a year later. The photo was published in 1953 in Mainichi Shimbun.
The Dark/Black Ocean Society was an influential Pan-Asianist group and secret society active in the Empire of Japan.
Tōyama Mitsuru (center), Kodama Yoshio (first row, second from right) on a meeting of the Dark/Black Ocean Society (Gen'yosha), 1929
A Gen'yōsha memorial