The Yamaguchi-gumi is the largest and most powerful organized crime syndicate in Japan, known as a yakuza group. Founded in 1915, it is based in Kobe and has a complex hierarchy with numerous affiliated gangs. The group is involved in various illegal activities, including drug trafficking, extortion, and gambling. The Yamaguchi-gumi operates under a strict code of conduct and is recognized for its distinctive tattoos and rituals. Despite its criminal activities, the group has a significant presence in Japanese society and has been known to engage in charitable acts, particularly during natural disasters.