The Suishin-kai was a Japan

Japan

Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

ese yakuza

Yakuza

, also known as , are members of traditional organized crime syndicates in Japan. The Japanese police, and media by request of the police, call them bōryokudan , literally "violence group", while the yakuza call themselves "ninkyō dantai" , "chivalrous organizations". The yakuza are notoriously...

 gang based in Nagasaki. The gang, affiliated with the Yamaguchi-gumi

Yamaguchi-gumi

is Japan's largest and most infamous yakuza organization. It is named after its founder Harukichi Yamaguchi. Its origins can be traced back to a loose labor union for dockworkers in Kobe pre-WWII....

, Japan's largest yakuza syndicate, came to prominence in April 2007 when its former underboss (then demoted to Captain), Tetsuya Shiroo

Tetsuya Shiroo

is the former leader of the Suishin-kai, a Nagasaki-based yakuza group affiliated with the Yamaguchi-gumi, the largest yakuza organization in Japan.On April 17, 2007, Shiroo shot Iccho Itoh, the mayor of Nagasaki, who died early the next morning....

, shot and killed the mayor of Nagasaki, Iccho Itoh

Iccho Itoh

, born , was the mayor of the Japanese city of Nagasaki; he first took office in 1995. He was a graduate from Waseda University, and majored in political science.-Career:...

.

The killing is believed to have been the result of a personal grudge on the part of Shiroo, and was not authorized by the Yamaguchi leadership or by Shiroo's colleagues in the Suishin-kai.

After the killing, the Suishin-kai faced intense police and public scrutiny as investigators raided their Nagasaki offices in the search for evidence. A few days later, the Suishin-kai announced that it would voluntarily disband, and most of its members are now affiliated with other groups.