Yakuza
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Yakuza, also known as gokudō, are members of transnational organized crime syndicates originating in Japan. The Japanese police and media, by request of the police, call them bōryokudan, while the yakuza call themselves ninkyō dantai. Wikipedia
Activities: Varied, including illegitimate businesses, an array of criminal and non-criminal activities
Ethnicity: Primarily Japanese; occasionally Koreans and Japanese Americans
Founded: 17th century; (presumed to have originated from the Kabukimono)
Membership: 10,400 members; 10,000 quasi-members
Notable members: Principal clans: Yamaguchi-gumi; Sumiyoshi-kai; Inagawa-kai