A Bulgarian Interior Ministry paper details coordinated actions against Western radio in the aftermath of the May 1977 Budapest meeting of Bloc security services. The paper identifies RFE, and notably several of its broadcasters who recently defected from Bulgaria, as a major threat. It accuses Western media of sensationalizing the murder of Georgi Markov (who was killed by the Zhivkov regime).

This note regarding the results of the visit of a group of Interior Ministry officials to the KGB in Moscow contains a proposal to develop a coordinated plan to discredit RFE and RL.

A collaborator of the Bulgarian intelligence service provided detailed information on the personnel situation within the RFE Bulgarian Service.

This document provides a detailed content analysis of the programs of individual Western broadcasters. It indicates particular sensitivity to broadcasts on Helsinki-related human rights issues, to the use of recent defectors with inside knowledge, and to Radio Free Europe's focus on domestic issues.

On 5 July 1963 the Bulgarian Ministry of Internal Affairs completed an information report on NATO's activity during the Cuban Missile Crisis. In the report, the ministry outlines detailed espionage carried out by NATO agents. According to the report, the NATO Military Intelligence Services provided instructions for NATO member-states' military attaches stationed in Warsaw Pact countries and agents they could get to cooperate with them. Agents were to observe and report specific military intelligence collecting in Warsaw Pact countries -- arms deliveries, missile sites, military movements, etc. The report also includes explanation of how the attaches carried out their intelligence gathering -- reading official press, speaking in Russian and misrepresenting themselves as Russian, etc . The Bulgarian Interior Ministry notes that Western governments were well-informed of Bulgarian military structures -- including exact formations and secret designations.

Bulgarian intelligence report on the developments during the 1958 Lebanon crisis.

A proposal for the measures against the Yugoslav agents and their collaborators who, on Tito’s behalf, were allegedly working for the annexation of the Pirin Region by the Yugoslav Federation.

Report on the intelligence activities of some Western governments in Sofia. The report identifies the main areas of interest of the foreign intelligence services, names of some agents and names of collaborators.

Detailed plan and timetable for the activities to expose intelligence operatives who have previously worked for Gestapo.

Turkish intelligence agents are trying to gather information on the uranium mining in southwest Bulgaria. They believe that the extracted deposits are shipped to the Soviet Union for further processing and production of nuclear bombs.