In the late 1920s the Italian National Fascist party became the only legitimate party. With its hierarchic, but at the same time capillary structure, and along with its supporting and associated establishments, it completely overwhelmed the Italian reality in the 1930s which held no more room for a civil society. The country was becoming increasingly totalitarian, although this process was never truly completed due to certain Italian specificities. An important element of the party's programme was aggressive nationalism which in the Giulia region, populated by Slovenes, resulted in the deliberate policy of the so called national penetration into the foreign nation, the result of which should have been a complete Italianization. The process, however, was not immediately successful, despite the use of violence. The fascist society and their government had to take into account the presence of Slovenes as much as the latter had to deal with the omnipresent party structures. In this sense, the article is firstly dedicated to thoroughly describe the party's administration in all of the Primorska provinces and secondly it tries to explain the presence of Slovene members in the party. Based on various sources it provides an evaluation of the extent of their cooperation with the leaders of local fascis. For the membership in general a more thorough overview is given for the areas around Idrija and the Karst; the motives that led Slovenes to join the Fascist party are partially indicated and partially explained with individual illustrated examples.