The monograph is written on the basis of documentary materials, including those discovered recently. The service-operational and combat activities of the state security agencies that fought against the occupiers in 1941-1944 are covered from a broad perspective. on the territory of Belarus. The issues of organizing special groups and detachments of the NKGB of the BSSR operating behind enemy lines, their material support, communications, interaction with partisans and other aspects of the fight against fascist invaders on Belarusian soil are examined from a critical perspective. Designed for researchers, teachers, graduate students, students history faculties and everyone interested in the history of Belarus.