East Germany's Stasi files opened (1990-1991)
Citizens' committees occupied Stasi offices as East Germany collapsed, preventing the destruction of files on millions of people. A 1991 law created a records authority and let citizens read their own files from January 1992.
Millions of files were preserved and a public agency was built to administer access.
File access fed vetting of public officials and decades of debate about informants and privacy.
Hungary's release is the Central European model of opening informant records, with one key difference: the names go online for anyone to search, not just to the person named.
