Answer
Martial law in Poland lasted for 1.5 years, from December 13, 1981, to July 22, 1983. It was imposed by Wojciech Jaruzelski, the leader of the Polish United Workers' Party, in an attempt to quell the Solidarity movement, which had been gaining momentum and threatening the Communist Party's hold on power. The martial law was characterized by widespread arrests, censorship, and repression.