Officially counting 58,600 members worldwide, this gang has the particularity of being organized as a legal associations. Divided into several gangs, their business sectors are amphetamine trafficking, prostitution, real estate, arms trafficking, extortion or corruption. The games and sports betting sector are also major businesses for the yakuza.

If a member commits a "small" mistake, he must cut off his finger. An unforgivable mistake is punished with a hara-kiri, suicidal gesture of the samurai.