The collection includes the documents of the Danube Circle Association, which was a non-governmental organization in opposition to the government’s project to construct a River Barrage Dam near Nagymaros (Hungary) in the 1980s. The Danube Circle movement tried to prevent the construction of the dam with samizdats, public debates, and protests. The Circle was one of the new types of alternative movements, which expanded the base of the “traditional” intellectual opposition.