The Toa-kai (東亜会 Tōa-kai) is a yakuza syndicate based in Tokyo with a predominantly Korean Japanese membership. Originally named the Tosei-kai (東声会 Tōsei-kai, "Voice of the East Gang"), with its historic leader Hisayuki Machii, the Toa-kai was deeply involved in the history of Tokyo's South Korean community and Japan's anti-communist circles in the 20th century. It is the fifth largest Yakuza clan.