Yamaguchi-gumi’s expansion and dominance

The Yamaguchi-gumi’s expansion and dominance mark a shift in the balance between organized crime and law enforcement: as the group grew more powerful, the police lost some of the leverage they had once gained by playing rival organizations against one another. Its ascendancy is presented not simply as an increase in numbers, but as the consolidation of resources, information, and influence that made organized crime harder to investigate and increasingly difficult to keep at a distance from ordinary institutions and people.

Consolidation and a changed balance

After Shinobu Tsukasa took power in 2005, the Yamaguchi-gumi became notably less cooperative with police. In earlier years, investigators could sometimes obtain information by exploiting rivalries: one group might inform on another, and the exchange could run in either direction. As the Yamaguchi-gumi became the dominant player, that balance weakened. A group with fewer meaningful rivals had less reason to trade information with the police.

The scale of that change was reflected in reports of intimidation. During a 2007 raid on a Kodo-kai office, Aichi police found detectives’ faces, family photographs, and home addresses displayed on the walls. Separately, the names of organized-crime detectives from another major police agency had been leaked online. The account presents these disclosures as more than intelligence gathering: they signaled that officers and their families could be identified and reached. It also warns that the old assumption that organized crime left the general population alone no longer held—even journalists and their children could be treated as targets.

Resources beyond numbers

A detective with the Osaka Prefectural Police Department described the broader organized-crime population as having remained near eighty thousand for sixteen years after Japan’s 1992 anti-yakuza legislation, while its money and power increased. In that detective’s assessment, the Yamaguchi-gumi’s consolidation made it a force to reckon with: its manpower and information network could rival the police, and its reach was expanding into industries where money could be made. The comparison to the Liberal Democratic Party emphasized the power of scale and organization, not a claim that the two institutions were alike in purpose.

That consolidation also mattered because police methods had not kept pace with the changing forms of crime. Organized-crime detectives were accustomed to investigating extortion and intimidation, while increasingly sophisticated schemes could involve stock manipulation or complicated fraud. The group’s advantage therefore lay not only in its size but in the gap between a broadening criminal economy and law-enforcement practices still adapted to simpler cases.

The wider criminal economy

The account illustrates this changing environment through examples involving other actors, rather than attributing every scheme to the Yamaguchi-gumi. Naoya Kaneko of the Sumiyoshi-kai described activities that included manipulating land prices, removing tenants, obstructing property auctions, illegal waste disposal, and protection payments connected to the sex industry in Omiya. He characterized information itself as a source of profit: businesses could be pressured to keep damaging information out of the press, while financially troubled companies could be drawn into arrangements that stripped their remaining assets and used their property to secure loans.

The same explanation showed how criminal proceeds could move through apparently ordinary businesses. The Sumiyoshi-kai operated or used staffing agencies, loan-sharking operations, an insurance company that submitted false claims, debt collection, pawnshops, ticket scalping, transport and security contracts, and a talent agency. A political organization could serve as a less conspicuous means of extracting money through overpriced newsletter subscriptions. These are examples of the broader yakuza economy, not evidence that each business or method was controlled by the Yamaguchi-gumi.

Susumu Kajiyama’s operation offers another distinct illustration of how a criminal enterprise could be built around a network of fronts and civilian labor. His companies included real estate and construction businesses, and employees were directed toward designated food outlets, restaurants, hotels, and resorts—arrangements through which money could be circulated through affiliated businesses. SK Finance, in Shinjuku, displayed a government license and presented itself as a legitimate consumer-loan operation; its property business could also take real estate as collateral and sell it when borrowers defaulted. The example complicates any picture of organized crime as an isolated band of violent men: its operations could depend on commercial structures and participants outside the formal organization.

Reach, information, and risk

Other episodes in the account show how information and connections could travel across institutional boundaries. In 2006, Jake Adelstein learned that the FBI had facilitated Tadamasa Goto’s entry into the United States through an arrangement involving Jim Moynihan. Goto had supplied authorities with names of gang leaders, documents, front-company lists, and leads on financial institutions used to launder money in the United States. The episode concerns Goto’s dealings with the FBI; it is not presented as an action by the Yamaguchi-gumi as an organization. It nevertheless underscores the high stakes of information-sharing within organized crime, where providing details about associates could risk expulsion or death.

The account also describes the vulnerabilities created by networks of surveillance and personal contacts. Alien Cop warned Jake Adelstein that people he had spoken with most often could become targets if Goto wanted to reach him or learn his whereabouts. A proxy could use a phone number to find an address, and a private detective agency could extend that capacity. The warning complicates the meaning of police protection: not every officer could be trusted, and a threat to one person could be routed through the people around him.

The Yamaguchi-gumi’s ascendancy thus forms part of a larger account of organized crime becoming more consolidated, commercially adaptable, and difficult to investigate. Its dominance weakened the police’s ability to exploit rivalries, while the surrounding examples reveal an economy in which information, business fronts, financial arrangements, and personal networks could all become instruments of power.