The Organisation of Ukrainian Nationalists is a Ukrainian political organisation which as a movement originally was created in 1929 in Western Ukraine (at the time interwar Poland). For long time OUN did not officially have its own flag; however, during the Hungarian and Polish aggression against the Republic of Carpathian Ukraine in 1939, Carpathian Sich, a militarised wing of OUN, adopted its flag from the OUN's emblem – golden nationalistic trident on a blue background. The flag was finalised and officially adopted by the organisation only in 1964 at the 5th Assembly of Ukrainian Nationalists.