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.

Following the Cuban Missile Crisis, General Diko Dikov, the Minister of Internal Affairs, drafted a report for General Semerdzhiev covering military movements inside West Germany(Federal Republic of Germany). Dikov includes a brief description of NATO and English military mobilization along with civilian preparations influenced by propaganda during the crisis.

A report by the Deputy Minister of Internal Affairs, Mircho Spasov, on the Ministerial Meeting in Bucharest of delegations from Romania, Bulgaria, Czechoslovakia, Hungary, and the Soviet Union. The meeting called for focusing on preventing subversive acts of Western intelligence, improving exchange of information, and conducting joint operations.

A report on the political climate in Western Europe and the activities of the Bulgarian communities abroad. The author concludes that since a new war seems imminent, the diplomatic and intelligence apparatus needs to be overhauled and old cadres dissmissed.

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

A report on the investigation of a political conspiracy, said to be organized by Metodiy Chavdarov, a colonel at the Sliven garrison. The arrested colonel and his accomplices allegedly conspired to overthrow the Fatherland Front government, once the Soviet troops leave the country.