During the late 19th and early 20th centuries, the increasingly tense geopolitical landscape led to a rise in cross-border espionage. In response, there was a growing need for robust counter-intelligence capabilities to thwart these activities effectively. The Russian Empire, as a bordering state with its rivals, the German and Austro-Hungarian Empires, lacked such a capability. Facing active competitor activities, it had to develop counter-intelligence capabilities. One of the most important fields of struggle was the peripheral territories, which included the governorates of Vilnius, Kaunas, and Suwałki. The article provides a detailed examination of the creation of the counter-intelligence apparatus and the activities of the gendarmerie of Vilnius Governorate in preventing the activities of spies.

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