Sakisaka was born in Ōmuta, Fukuoka in 1897. He graduated from University of Tokyo in 1921. When he was a university student, he read Karl Marx’s writings to study German, and he became a Marxist. He studied in Germany from 1922 to 1925. During the hyperinflation in Germany after World War I, he was able to purchase a lot of Karl Marx’s writings. After he returned to Japan, he became an assistant professor at Kyushu University. In 1926, he became a professor. He was also known as a coterie of the magazine "Rōnō" and an artist and became one of the leading Marxian economists in Japan. When the crackdown against socialism and communism became severe, Sakisaka was resigned with two other professors in 1928. He moved to Tokyo, and involved in compilation and translation of the remodeled "Marx Engels complete collection". In 1930s, he was active as a representative of the group "Rōnō". In 1937 he was arrested and imprisoned in connection with the First Popular Front Incident. After spending bail, speech activity was sealed, translated German books anonymously, and lived self-sufficiently in agriculture. While World War II, many socialists and communists turned for life, he was not able to actively resist the regime, but he was not support the regime. After World War II, socialism and communism movement were made possible again. Sakisaka began to insist that revolution in Japan is Nonviolent revolution, and he returned to Professor of Economics at Kyushu University. After Japan Socialist Party was split in 1950, he established "Socialist Association" with Hitoshi Yamakawa, and he became a representative theorist of the Leftist Socialist Party. Leftist Socialist Party and Rightist Socialist Party were merged in 1955, but he opposed it. Sakisaka gather lectures and speech activities at universities, lectures on "Das Kapital" by gathering Socialist Party and labor union activists at home, casually visiting study sessions nationwide and putting emphasis on educating workers. He gradually became a charisma among activists of the "Socialist Association". Especially he put effort into activist training at the Mitsui Miike coal mine in Fukuoka prefecture, and it was the activists that he fostered the center of the Miike dispute in 1960. Miike struggle eventually ended in full defeat by the workers, but his thought began to exert a big influence on socialist activists. From 1960s to 70s, Socialist Association that kept lower activists began to have a great say within the Socialist Party. His sentiment was strongly reflected in the "Socialist Association Thesis" decided in 1968, which could be said to be the culmination of his socialist thought. From 1960s, he built a relationship with the Soviet Union. He died in 1985.
