Obóz Zjednoczenia Narodowego (Polish pronunciation: [ˈɔbuz zjɛdnɔˈtʂɛɲa narɔdɔˈvɛɡɔ], English: Camp of National Unity; abbreviated "OZN"; and often called "Ozon" (Polish for "ozone") was a Polish political party founded in 1937 by sections of the leadership in the Sanacja movement.A year after the 1935 death of Poland's Chief of State Marshal Józef Piłsudski, in mid-1936, one of his followers, Marshal Edward Rydz-Śmigły, attempted to unite the various government factions under his leadership.