The Committee Investigating The Crimes Committed By Occupiers And Their Accomplices was set up by the Slovenian National Liberation Movement in 1944 and continued working as a government body after the Second World War. Its task was not only to investigate the war crimes committed in Primorska, the Slovenian ethnic territory annexed to the Italian monarchy in 1918, but also to gather information on the specific, institutionalized violence exercised by the Italian state (through denationalization) and, in particular, the fascist forces between 1918 and 1941. In the paper, the author presents the scheme for ascertaining the various forms of pressure to which the population was subjected in the implementation of the denationalization policy, as well as the findings and their quantification.