Internal Macedonian Revolutionary Organization

The Internal Macedonian Revolutionary Organization (IMRO; Bulgarian: Вътрешна македонска революционна организация (ВМРО), romanized: Vatreshna Makedonska Revolyutsionna Organizatsiya (VMRO); Macedonian: Внатрешна македонска револуционерна организација (ВМРО), romanized: Vnatrešna Makedonska Revolucionerna Organizacija (VMRO)) was a secret revolutionary society founded in the Ottoman territories in Europe that operated in the late 19th and early 20th centuries. It was founded in 1893 in Salonica and initially aimed to secure autonomy for Macedonia and Adrianople regions in the Ottoman Empire.

Source: Wikipedia — Internal Macedonian Revolutionary Organization (CC BY-SA 4.0)