The Chiba District Court handed Isao Seki, the head of the Sumiyoshi-kai organized crime group, a suspended one-year prison sentence for election-law violations(Aug. 3 2015).

The Mito District Court ordered Isao Seki, head of Japan’s second largest crime syndicate, Sumiyoshi-kai, to pay damages over money transfer scams committed by a fraud group formed by an affiliated gang member. It is the first time that a yakuza boss has been held liable, in light of a revised anti-gangster law, for a so-called special fraud case. The Yakuza, as an organization, are NOT outlawed in Japan. Although one of the crimes listed under Japan’s “Anti-Terrorism” Law is “Organised Fraud”. Those who engage in organised fraud can be arrested and charged under the act. The Sumiyoshi-kai is the second largest yakuza family, with 20,000 members divided into 277 clans. Sumiyoshi-kai is a confederation of smaller yakuza groups. Its current head (会長 oyabun) is Isao Seki.
On June 7,2015 Isao Seki,then 69, was arrested by Chiba Prefectural Police for arranging a meeting at a “snack” hostess club in Isumi City in early March for supporters and voters of the Liberal Democratic Party’s Masakazu Koji. The meeting had been held prior to that allowed by election laws.