The is a yakuza organization based in Chiba, Japan."Police of Japan 2011, Criminal Investigation : 2. Fight Against Organized Crime", December 2009, National Police Agency The Soai-kai is a designated yakuza group with an estimated 80 active members.
History The Soai-kai was formed in 1945 by Toramatsu Takahashi, then a member of a Yokohama-based bakuto group named the Sasada-ikka. Originally named the as an affiliate of the Sasada-ikka, the group was renamed the and again renamed the Soai-kai in 1955 when the group became independent from the Sasada-ikka."1993 Police White Paper Chapter 1 : The Actual Condition of the Boryokudan", 1993, National Police Agency
Condition Headquartered in Ichihara, Chiba, the Soai-kai is one of the three dominating yakuza groups in Chiba Prefecture, along with the Sumiyoshi-kai and the Inagawa-kai."Condition of Boryokudan" , as of late 2010, Chiba Prefectural Police
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