The clandestine post stamp on the 10th anniversary of Charter 77

During the 1980s, Solidarity had to go underground. Its activists were prosecuted and jailed. The Security Services carried out a number of abductions, beatings, and even murders of Solidarity members. These crimes were mostly covered up by the regime, and many of them remain unsolved to this day. Nevertheless, Solidarity continued to carry on a propaganda war against the Communists and keep themselves alive in the minds of Poles, who were being worn down by repression and economic crisis.