From the mid-1970s well into the 1980s, the Federal Alliance of Citizens' Initiatives for Environmental Protection (BBU) was one of Germany's most visible and influential environmental organisations, an unusual achievement for a network of local organisations. Lacking strong competitors, it was able to become a central movement organisation for Germany's rapidly growing anti-nuclear power and environmental movements. However, after institutionalisation of environmental concerns robbed the movement of some of its impetus, competing social movement organisations appeared, and government subsidies ended, familiar problems of grass-roots networks, which had plagued the BBU from the beginning, intensified. The resulting downward spiral cost the BBU most of its members and its prominence. [ABSTRACT FROM AUTHOR]