Yulia Karadachka-Simeonova is the chief bibliographer and head of the bibliographic and information services department. With scientific interests in the field of history and art history, Y. Karadachka was involved in the creation of the collection "Only forbidden newspapers remain in history". Taking into account the variety of forms of opposition to the totalitarian regime, Karadachka stresses the difficulty, even impossibility to clearly distinguish political and cultural opposition. Newspapers and magazines of opposition parties, for example, such as the Bulgarian Agrarian People's Union “Nikola Petkov”, the Social Democratic Party and other parties banned by the communist regime played an important cultural role as well, criticizing the lack of basic civil liberties, the restrictions on freedom of expression.