IMRO was a "state within the state" in the region in the 1920s using it to launch attacks in the Serbian and Greek parts of Macedonia. By that time IMRO had become a right-wing Bulgarian ultranationalist organization. According to IMRO statistics during the 1920s in the region of Yugoslav (Vardar) Macedonia operated 53 chetas (armed bands), 36 of which penetrated from Bulgaria, 12 were local and 5 entered from Albania. In the region of Greek (Aegean) Macedonia 24 chetas and 10 local reconnaissance detachments were active. Thousands local of Slavophone Macedonians were repressed by the Yugoslav and Greek authorities on suspicions of contacts with the revolutionary movement. The population in Pirin Macedonia was organized in a mass people's home guard. This militia was the only force, which resisted to the Greek army when general Pangalos launched a military campaign against Petrich District in 1925, speculatively called the War of the Stray Dog. IMRO's constant fratricidal killings and assassinations abroad provoked some within Bulgarian military after the coup of 19 May 1934 to take control and break the power of the organization. Meanwhile, the left-wing later did form the new organisation based on the principles of independence and unification of partitioned Macedonia. The new organisation which was an opponent to Ivan Mihailov's IMRO was called IMRO (United). It was founded in 1925 in Vienna. However, it did not have real popular support and remained active until 1936 and was funded by and closely linked to the Comintern and the Balkan Communist Federation. In 1934 the Comintern adopted resolution about the recognition of Macedonian nation and confirmed the project of the Balkan Communist Federation about creation of Balkan Federative Republic, including Macedonia.