In December 1923, the Balkan Communist Federation held its Fifth Conference in Moscow. In 1924 the Comintern entered negotiations about collaboration between the Communists and the Internal Macedonian Revolutionary Organization (IMRO), Internal Thracian Revolutionary Organisation (ITRO) and Internal Dobrujan Revolutionary Organisation (IDRO), and the creation of a united revolutionary movement. The idea for a new unified organization was supported by the Soviet Union, which saw a chance for using this well developed revolutionary movements to spread revolution in the Balkans and destabilize the Balkan monarchies.