13 December marks the anniversary of introduction of martial law in Poland. An authoritarian government, led by General Wojciech Jaruzelski and the Military Council of National Salvation (WRON), introduced severe political oppression in an attempt to crush political opposition. Martial law lasted till July 1983 being officially suspended on 18 December 1982. All that time was a trauma for the Poles and democratic opposition.
Katarzyna Ścierańska: The Introduction of Martial Law in Poland