 Combat Organization of the 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.Its operations reached their zenith about 1904–1908, when it numbered over 2,000 members, including over 700 paramilitary personnel, and carried out over 2,500 operations.