"p."The Polish Sanation authorities were provoked by the independence-seeking Organization of Ukrainian Nationalists (OUN). OUN engaged in political assassinations, terror and sabotage, to which the Polish state responded with a repressive campaign in the 1930s, as Józef Piłsudski and his successors imposed collective responsibility on the villagers in the affected areas. After the disturbances of 1933 and 1934, the Bereza Kartuska prison camp was established; it became notorious for its brutal regime. The government brought Polish settlers and administrators to parts of Volhynia with a centuries-old tradition of Ukrainian peasant rising against Polish land owners (and to Eastern Galicia). In the late 1930s, after Piłsudski's death, military persecution intensified and a policy of "national assimilation" was aggressively pursued. Military raids, public beatings, property confiscations and the closing and destruction of Orthodox churches aroused lasting enmity in Galicia and antagonized Ukrainian society in Volhynia at the worst possible moment, according to Timothy D. Snyder. However, he also notes that "Ukrainian terrorism and Polish reprisals touched only part of the population, leaving vast regions unaffected" and "the OUN's nationalist prescription, a Ukrainian state for ethnic Ukrainians alone was far from popular". Halik Kochanski wrote of the legacy of bitterness between the Ukrainians and Poles that soon exploded in the context of World War II. See also: History of the Ukrainian minority in Poland.