Krystyna Krauze (left) carrying a banner reading "No more brotherly aid" at a proest in Cieszyn, Poland, organised by Polish-Czechoslovak Solidarity on the 21st anniversary of the invasion on 21 August 1989. The photograph was taken by the Independent Photo Agency NAF Dementi, whose archive is managed by the Wrocław-based organisation Ośrodek "Pamięć i Przyszłość" (the use of the photograph is subject to licence)