13th December 1981

On 13th December 1981 martial law was introduced in Poland...   

Martial law refers to the period of time from December 13, 1981 to July 22, 1983, when the authoritarian government of the People's Republic of Poland drastically restricted normal life by introducing martial law in an attempt to crush political opposition. Thousands of opposition activists were interned without charge and as many as 100 people were killed. Although martial law was lifted in 1983, many of the political prisoners were not released until the general amnesty in 1986.

President Ronald Reagan in his speech on 23rd December 1981 asked Americans to light a candle in support of freedom in Poland. 

martial law - stan wojenny

People's Republic of Poland - Polska Rzeczpospolita Ludowa