| People's Socialist Revolutionary Party | |
| Native Name: | Herri Alderdi Sozialista Iraultzailea |
| Secretary General: | Alberto Figueroa (1977-1978) Txomin Ziluaga (1979-1989) |
| President: | Santiago Brouard (1978-1984) |
| Wing1 Title: | Paramilitary wing |
| Foundation: | [1] |
| Ideology: | Basque independence Communism Marxism-Leninism Abertzale Left |
| Position: | Far-left |
| National: | Herri Batasuna Koordinadora Abertzale Sozialista |
| Merger: | Euskal Herriko Alderdi Sozialista (EHAS) Eusko Sozialistak (ES) |
| Colorcode: | red |
| Country: | Spain |
| State: | Basque Country |
People's Socialist Revolutionary Party (Basque: Herri Alderdi Sozialista Iraultzailea; HASI) was a non-legal Basque political party, considered commonly to be the political branch of ETA. It always ran as part of the coalition of the Basque National Liberation Movement, Herri Batasuna, until its self-dissolution in the 1990s. The party's acronym "HASI" means "to begin" in Basque language.
Casanova, Iker; Asensio, Paul (2006). Argala. Tafalla (Navarra): Editorial Txalaparta. p. 376. .