Between 1920 and 1943, several anti-fascist movements were active among the Slovenes and Croats in the territories annexed to Italy after World War I, known as the Julian March.Milica Kacin Wohinz, Jože Pirjevec, Storia degli sloveni in Italia : 1866–1998 (Venice: Marsilio, 1998)Milica Kacin Wohinz, Narodnoobrambno gibanje primorskih Slovencev : 1921–1928 (Trieste: Založništvo tržaškega tiska, 1977) The most influential was the militant insurgent organization TIGR, which carried out numerous sabotages, as well as attacks on representatives of the Fascist Party and the military.Milica Kacin Wohinz, Prvi antifašizem v Evropi (Koper: Lipa, 1990)Mira Cenčič, TIGR : Slovenci pod Italijo in TIGR na okopih v boju za narodni obstoj (Ljubljana: Mladinska knjiga, 1997) Most of the underground structure of the organization was discovered and dismantled by the Organization for Vigilance and Repression of Anti-Fascism (OVRA) in 1940 and 1941,Vid Vremec, Pinko Tomažič in drugi tržaški proces 1941 (Trieste: Založništvo tržaškega tiska, 1989) and after June 1941 most of its former activists joined the Slovene Partisans.
