was a founder of the Japanese Communist Party (JCP) who worked for periods as a writer, editor, labor organizer, communist agent, politician, and university professor. He was the son of a wealthy Japanese merchant, and attended the prestigious Keio University. While in university, Nosaka became interested in social movements, and joined a moderate labor organization after graduation, working as a research staff member, and as a writer and editor of the organization's magazine. He traveled to Britain in 1919 to study political economy, where he deepened his studies of Marxism and became a confirmed communist. Nosaka was a founding member of the British Communist Party, but his activity within British communist circles led to him being deported from Britain in 1921.