Asparuhov, ValentinPendzhekova-Hristeva, Rusalena2025-12-152025-12-152025-12-152534-8442https://doi.uni-plovdiv.bg/handle/store/830The article examines archival documents of the State Security Service (DS) related to the “Mini Maritsa-Iztok” industrial complex during the 1960s and 1970s. Through an analysis of materials from literni (code-name) files, it traces how agent–operative and counterintelligence activities influenced organizational–managerial and technical–engineering decisions and challenges within this strategic energy sector. The study presents specific examples illustrating the mechanisms of surveillance, control, and institutional intervention exercised by the DS.otherMini Maritsa-Iztokliterni filesState Security Servicearchival documentsArticle