Polish Socialist Party
The Combat Organization of the Polish Socialist Party (, abbreviated "OBPPS"), also translated as Fighting Organization of the Polish Socialist Party; also known as "bojówki" (paramilitary units); "Organizacja Spiskowo-Bojowa PPS" ("PPS" Underground-Combat Organization); "Koła Bojowe Samoobrony Robotniczej" (Workers' Self-Defense Combat Circles) and "Koła Techniczno-Bojowe" (Combat-Technical Circles), was an illegal Polish guerrilla organization founded in 1904 by Józef Piłsudski.