The Ustaše was a Croatian right-wing ultranationalist movement founded in 1929 by Ante Pavelić. After the establishment of the 6 January Dictatorship by Alexander I of Yugoslavia, Pavelić fled to Italy where he set up his organization's headquarters. Prior to World War II the Ustaše functioned as a paramilitary and terrorist organization, as it sought the separation of Croatia from Yugoslavia into an independent state through violent means. Notably, it was involved in the assassination of King Alexander in 1934 with the assistance of the Internal Macedonian Revolutionary Organization (IMRO). The Ustaše however lacked broad support due to its radical and violent nature. When Nazi Germany invaded Yugoslavia in 1941, its territories were occupied by German, Italian and Hungarian forces. A german puppet-state, the Independent State of Croatia (NDH) was established and ruled by Pavelić and the Ustaše. During the Second World War, the Ustaše conducted genocide against Serbs, Roma and Jews within their borders. The Jasenovac concentration camp was a notorious death camp where extermination of these groups took place. After the war ended, many of the Ustaše fled to safety abroad in countries like Argentina and Spain. In 1957 Pavelić was wounded after an assassination attempt on him and died two years later from his injuries.