The Internal Macedonian Revolutionary Organization (IMRO) promoted the concept of an Independent Macedonia in the interwar period. Its leaders—including Todor Alexandrov, Aleksandar Protogerov, and Ivan Mihailov—promoted independence of the Macedonian territory split between Serbia and Greece for the whole population, regardless of religion and ethnicity. The Bulgarian government of Alexander Malinov in 1918 offered to give Pirin Macedonia for that purpose after World War I, but the Great Powers did not adopt this idea because Serbia and Greece opposed it. In 1924, the Communist International (Comintern) suggested that all Balkan communist parties adopt a platform of a "United Macedonia" but the suggestion was rejected by the Bulgarian and Greek communists.