Sakai Toshihiko (堺 利彦, November 25, 1871 – January 23, 1933) was a Japanese socialist. He advocated opposition to the Russo-Japanese War, founded the Heiminsha and published the newspaper Heimin Shimbun. He formed the Japan Socialist Party and the Japanese Communist Party, and became the first general secretary of the Japanese Communist Party. His pen name is Saka Kosen (堺枯川). He is also known for his translation with Kōtoku Shūsui. Source: Wikipedia (en)