Czesław Kiszczak quasi-government administering Poland during the martial law (1981–83). In 1982 he became a deputy member of the Politburo of the Polish United Workers' Party and a full member in 1986. From December 1981 until June 1989 Kiszczak was the second most important person in Poland, after General Wojciech Jaruzelski, the nation's top leader. Together they orchestrated the crackdown aimed at crushing the "Solidarity", the Eastern Bloc’s first non-communist labor union movement. Martial law included the mass roundup and internment of "Solidarity" activists, curfews and other harsh measures. Generals Kiszczak and Jaruzelski later insisted that they were imposing martial law to
Wojciech Jaruzelski appearances. However, Wałęsa persuaded the Communists' two allied parties, the United People's Party (ZSL) and the Alliance of Democrats (SD), to break their alliance with the PZPR. Accepting that he would have to appoint a Solidarity member as prime minister, Jaruzelski then asked Wałęsa to select three candidates, one of whom he would ask to form a government. Ultimately, Tadeusz Mazowiecki, who had helped organize the roundtable talks, was selected as first non-Communist prime minister of an Eastern Bloc country in four decades. Jaruzelski resigned as president in 1990. He was succeeded by Wałęsa, who had won the presidential election