 The Bulgarian premier Aleksandar Stamboliyski started then a campaign against the IMRO after his visit to Belgrade in May 1921.At this point Stamboliyski decided upon an anti-IMRO guerrilla, entrusting the job to Panitsa and other "federalists".In the bloody battles that followed, Panitsa's federalists set out to destroy the IMRO, but it scattered them, after which Panitsa fled to Greece in 1922.