The work aims to study the formation of a system of ideological influence on the Izmail region’s population in 1944–1945. Based on archival sources and materials of the regional press, the tasks of agitation and propaganda activities, the general forms and methods used by the Communist Party to spread ideology among the population of the annexed region were revealed. The author paid particular attention to determining the role of the regional party leadership in managing and conducting agitation and propaganda. The methodology. The study is based on the principles of historicism, scientificity, objectivity, systematics, specificity, and reliance on historical sources. With the aid of the historical-typological method, it was possible to determine the main tasks, forms, and methods of agitation and propaganda. The historical-comparative method opens the way to reveal the peculiarities of ideological work with various categories of the citizens and to determine the specific features of the Communist Party’s agitation and propaganda activities in the Izmail region. The application of historical-systemic and historical-genetic methods contributed to the consideration of various measures to ideologize the population in co-relation, to identify the causal links between the methods and results of propaganda policy. The scientific novelty. For the first time, a comprehensive analysis of agitation and propaganda activities in the Izmail region after the territory was returned to the USSR has been carried out. The conclusions. The analysis of the party documentation of the Izmail regional committee of the Communist Party gives reason to assume that immediately after the region returned to the USSR, the Soviet leadership launched active information and propaganda activities among the population. During 1944–1945, a network of agitation teams, groups of lecturers and speakers was formed to spread communist ideology among various segments of the population, a system of party propaganda bodies was created, events to celebrate new Soviet holidays were organized, and radio broadcasting and adaptation for the cinema were organized. The media, cultural and educational institutions, Komsomol organizations, and pioneers played a significant role in propaganda activities. Propaganda and agitation departments established at the region, city, and district committees of the Communist Party were constantly monitoring the ideological activity progress.