The Sixth Congress of the Balkan Communist Federation under the leadership of the Bulgarian communist Vasil Kolarov and the Fifth Congress of the Comintern, an adjunct of the Soviet foreign policy, held concurrently in Moscow in 1923, voted for the formation of an ""Autonomous and Independent Macedonia and Thrace"." In 1924 IMRO entered negotiations with the Macedonian Federative Organization and the Comintern about collaboration between the communists and the Macedonian movement and the creation of a united Macedonian movement. The idea for a new unified organization was supported by the Soviet Union, which saw a chance for using this well developed revolutionary movement to spread revolution in the Balkans and destabilize the Balkan monarchies. Alexandrov defended IMRO's independence and refused to concede on practically all points requested by the Communists. No agreement was reached except for a paper "Manifesto" (the so-called May Manifesto of 6 May 1924), in which the objectives of the unified Macedonian liberation movement were presented: independence and unification of partitioned Macedonia, fighting all the neighbouring Balkan monarchies, forming a Balkan Communist Federation and cooperation with the Soviet Union. Failing to secure Alexandrov's cooperation, the Comintern decided to discredit him and published the contents of the Manifesto on 28 July 1924 in the "Balkan Federation" newspaper. VMRO's leaders Todor Aleksandrov and Aleksandar Protogerov promptly denied through the Bulgarian press that they've ever signed any agreements, claiming that the May Manifesto was a communist forgery.