Bulgarian Communist-era military intelligence archives will now be open to researchers and journalists, Defence Minister Nikolay Nenchev announced Wednesday.
The minister said he had released around 30,000 archived objects to the Civil Commission, which is in charge of examining documents from this period.
In principle, the revelation of ex-agent names and collaborators of the Bulgarian secret service has no legal consequences, AFP announced.
In 2011, however, dozens of Bulgarian ambassadors, including those posted in Berlin, Athens, Beijing, Stockholm and at the UN and UNESCO, were recalled after their past activities were revealed.
Until now, the Communist-era archives were only accessible to the defence minister, under the pretext of keeping the names of foreign agents secret. But the president of the Civil Commission, Evtim Kostadinov, said the names will remain secret.
Until the fall of communist dictator Todor Zhivkov in 1989, Bulgaria was considered one of the most loyal allies to the former Soviet Union, and its secret service sometimes assassinated opponents abroad, including with the infamous "poisoned umbrella" murder of Bulgarian defector Georgy Markov in 1978.