Ivan Mihailov Gavrilov (Bulgarian: Иван Михайлов Гаврилов; 26 August 1896 – 5 September 1990), sometimes Vancho Mihailov, was a Bulgarian revolutionary in interwar Macedonia, and the last leader of the Internal Macedonian Revolutionary Organization (IMRO). Under Mihailov, the IMRO identified itself closely with Bulgarian nationalism. He also cooperated actively with Mussolini's Fascist Italy, Admiral Horthy's Hungary and Hitler's Nazi Germany. He changed the organization's tactics from guerrilla campaigns to individual terrorist acts. Numerous terrorist attacks were carried out by IMRO against Yugoslav officials under his leadership, the most spectacular of which was the assassination of Alexander I of Yugoslavia, in collaboration with Croatian Ustaše. During the last stage of the Second W