The decline of Japan’s Yakuza did not begin with a nuclear weapons deal, but gun violence during the 1980s played an important role in turning the public and government against organized crime.
For decades, Yakuza groups operated openly in Japan. Some maintained offices, displayed organization symbols and presented themselves as disciplined associations rather than ordinary criminal gangs. That image became increasingly difficult to defend as violent conflicts erupted between rival factions.
The Yama–Ichi War Changed Everything
One of the most important turning points came with the Yama–Ichi War, which lasted from 1985 until 1989.
The conflict began after a major leadership dispute within the Yamaguchi-gumi, Japan’s largest Yakuza organization. A breakaway faction formed the Ichiwa-kai, leading to years of assassinations, shootings and retaliatory attacks.
The violence was unusually public. Rival members were attacked in homes, businesses and city streets. Dozens of people were killed, and hundreds of violent incidents were connected to the conflict.
Although Japan has extremely strict gun laws, Yakuza groups had access to illegally imported firearms. The frequent shootings shattered the idea that organized crime could remain contained within its own world. The violence threatened ordinary citizens and created growing pressure for the government to respond.
The Government Crackdown
The Yama–Ichi War did not destroy the Yakuza by itself, but it helped build support for stronger anti-organized-crime laws.
Japan passed the Anti-Boryokudan Law in 1991, and it took effect in 1992. The law officially identified major Yakuza organizations as violent groups and restricted their ability to intimidate citizens, collect money and operate openly.
Later laws placed greater responsibility on Yakuza bosses for crimes committed by their members. Local governments also introduced exclusion ordinances that discouraged businesses and individuals from maintaining relationships with organized-crime groups.
These restrictions made daily life increasingly difficult for known Yakuza members. They could be denied bank accounts, apartments, insurance policies, mobile-phone contracts and other basic services.
Membership began falling rapidly as the financial and social cost of belonging to a Yakuza organization increased.
What About the Nuclear Deal?
The alleged nuclear-material trafficking case happened decades later and was not responsible for beginning the Yakuza’s decline.
The case involved Takeshi Ebisawa, a Japanese organized-crime figure accused by United States authorities of attempting to arrange the sale of uranium and weapons-grade plutonium originating from Myanmar.
According to prosecutors, Ebisawa discussed trading nuclear materials for military weapons, including surface-to-air missiles. The investigation involved undercover agents and developed primarily between 2019 and 2020.
Ebisawa was arrested in 2022, making the case part of the modern history of Japanese organized crime rather than the beginning of its downfall.
The case was shocking because it suggested that some individuals connected to organized crime were attempting to participate in international weapons and nuclear-material trafficking. However, by that point, traditional Yakuza organizations had already been weakening for decades.
The Real Beginning of the Fall
The Yakuza’s decline was gradual rather than sudden.
Membership had already begun falling from its historic peak during the 1960s. The violent gang wars of the 1980s damaged the organizations’ public image and encouraged political action. The laws introduced during the 1990s and 2000s then attacked their ability to earn money and operate openly.
The 1980s can therefore be seen as a major turning point, particularly because of the widespread use of firearms during the Yama–Ichi War.
The nuclear-material case, however, belongs to a much later chapter.
The Yakuza did not fall because of one gun battle, one law or one international conspiracy. Its decline resulted from decades of internal warfare, public outrage, stronger policing, financial restrictions and legal pressure that slowly made the traditional Yakuza model nearly impossible to maintain.
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