Yakuza are members of Japanese organized crime groups.
During the infamous gang war, a man named Akahara ran the Yakuza in Gotham City. He attended a gang-leader summit that went wrong, and was shot dead next to his katana-wielding bodyguard. His replacement, Niko, protected the gang from a takeover attempt by Orpheus.
One of the first criminal acts under Black Mask's command, was the reactivation of the drug trade in the city with help from Mad Hatter's mind controlling hats. Batman found a fraction of the gang and stopped their crime spree.
The Los Angeles branch of the Tokyo Yakuza was autonomously run by the octogenarian oyabun, Shoko Ishiguro. Clan Ishiguro was a profitable organization, controlling a large portion of the heroin trade while expanding into prostitution and pornography. It was all run from the legitimate company, Ishiguro Technologies.
The powerful criminal operation was dismantled entirely in just a matter of days, after Ishiguro's young saiko-komon, Ame Okumura, was inadvertently possessed by the demon, Etrigan, inciting a disastrous chain of events.
Equipment: None known.
Transportation: None known.
Weapons: None known.
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