Organization of Ukrainian Nationalists

The Organization of Ukrainian Nationalists (OUN; Ukrainian: Організація українських націоналістів) was established on February 2, 1929, in Vienna, merging the Ukrainian Military Organization with various radical nationalist youth groups. The OUN became one of the largest far-right organizations in Ukraine during the interwar period, particularly active before, during, and after World War II.

OUN's ideology has been characterized by scholars as a form of Ukrainian fascism or integral nationalism, influenced by figures such as Dmytro Dontsov, as well as Italian and German fascism. The organization pursued a strategy of violence, terrorism, and assassinations to create a totalitarian Ukrainian state.

In 1940, the OUN split into two factions: the more moderate OUN-M led by Andriy Melnyk and the radical OUN-B led by Stepan Bandera. On June 30, 1941, OUN-B declared an independent Ukrainian state in Lviv, shortly after the city came under Nazi control. This declaration led to a temporary alliance with Germany, which was viewed as liberating Ukrainians from Soviet oppression.

The OUN-B's actions included participation in the Lviv pogroms and involvement in the Holocaust in Ukraine and Poland. In October 1942, OUN-B established the Ukrainian Insurgent Army (UPA), which conducted violent campaigns against Polish populations in Volhynia and Eastern Galicia between 1943 and 1944.

As World War II concluded and Nazi Germany faced defeat, OUN-B attempted to reframe its political stance, adopting democratic rhetoric. After the war, the UPA engaged in conflict against Soviet and Polish forces. The Polish government, through Operation Vistula in 1947, deported 140,000 Ukrainians, while Soviet forces targeted UPA members and supporters.

During the Cold War, the OUN received covert support from Western intelligence agencies, including the CIA. In the mid-1950s, the OUN-B experienced another split, leading to the establishment of the Congress of Ukrainian Nationalists party and the OUN-M transitioning into a non-governmental organization.

The OUN emerged in the context of the Second Polish Republic's control over western Ukraine after World War I, which fueled the desire for Ukrainian independence. The organization conducted numerous violent actions against Polish officials and sought to establish a Ukrainian state free from both Polish and Soviet influence.

By the onset of World War II, the OUN had approximately 20,000 active members and a larger base of sympathizers, reflecting a radicalized youth disillusioned with traditional political avenues. The group's legacy remains complex, characterized by its nationalist fervor and controversial methods.