In 1915, after a conference in Bucharest, it was decided to create a Revolutionary Balkan Social Democratic Labour Federation, comprising groups which adhered to the Zimmerwald Conference and opposed participation in World War I. Initially headed by Christian Rakovsky, it had Vasil Kolarov and Georgi Dimitrov among its prominent activists. In 1915, Dimitrov wrote that Macedonia, "... which was split into three parts ...", would be, "... reunited into a single state enjoying equal rights within the framework of the Balkan Democratic Federation." [2] This independent and united Macedonia would have consisted of the corresponding geographical departments of Bulgaria, Yugoslavia, and Greece. The leaders of the Federation were repressed by the Balkan governments at different intervals.