SB. In October 1943 Bulba-Borovets largely disbanded his depleted force in order to end further bloodshed. In their struggle for dominance in Volhynia, the Banderists would kill tens of thousands of Ukrainians for links to Bulba-Borovets or Melnyk. OUN-B's fight against Germany, Soviet Union and Poland By the fall of 1943 the OUN-B forces had established their control over substantial portions of rural areas in Volhynia and southwestern Polesia. While the Germans controlled the large towns and major roads, such a large area east of Rivne had come under the control of the OUN-B that it was able to set about creating a "state" system with military training schools, hospitals and a school system, involving tens of thousands of personnel. Its combat organization, the UPA, which came under the command of Roman Shukhevich in August 1943, would fight only limited skirmishes and defensive actions against the Germans. The USSR was considered the primary enemy, and the fight against the Soviets continued until the mid-1950s. It would also play a major role in the massacres of Poles in Volhynia and Eastern Galicia from western Ukraine. Towards the end of the war It is believed that the OUN ordered the assassination of Ukrainian writer Yaroslav Halan in 1949 who was highly critical of the organisation. After the Second World War After the war, the OUN in eastern and southern Ukraine continued to struggle against the Soviets; 1958 marked the last year when an OUN member was arrested in Donetsk. Both branches of the OUN continued to be quite influential within the Ukrainian diaspora. The OUN-B was formed in 1943 by an organization called the Anti-Bolshevik Bloc of Nations (headed by Yaroslav Stetsko). The Anti-Bolshevik Bloc of Nations it created and headed would include at various times emigre organizations from almost every eastern European country with the exception of Poland: Croatia, the Baltic countries of Estonia, Latvia and Lithuania, anti-communist emigre Cossacks, Hungary, Georgia, Bohemia-Moravia (today the Czech Republic), and Slovakia. In the 1970s, the ABN was joined by anti-communist Vietnamese and Cuban organizations. The Lithuanian partisans had particularly close ties with the OUN. In 1956 Bandera's OUN split into two parts, the more moderate OUN(z) led by Lev Rebet and Zinoviy Matla, and the more conservative OUN led by Stepan Bandera. After the dissolution of the Soviet Union, both OUN factions resumed activities within Ukraine. The Melnyk faction threw its support behind