The Macedonian Youth Secret Revolutionary Organization or MYSRO; (Bulgarian: Македонска младежка тайна революционна организация, Macedonian: Македонска младинска тајна револуционерна организација), was the name of a secret pro-Bulgarian youth organization established by the Internal Macedonian Revolutionary Organization, active across the most regions of Macedonia between 1922-1941. The statue of MYSRO was approved personally from the leaderof the Internal Macedonian Revolutionary Organization (IMRO), Todor Alexandrov. The aim of MYSRO was in concordance with the statue of IMRO - unification of all of Macedonia in an authonomous unit, within a future Balkan Federative Republic.