Wojciech Jaruzelski this Soviet-controlled First Polish Army during the war. He participated in the 1945 Soviet military takeover of Warsaw and the Battle of Berlin. By the time the war ended that year, he had gained the rank of lieutenant. He "further credited himself in Soviet eyes" by engaging in combat against the non-Communist Polish Home Army, from 1945 to 1947. After the end of the war, Jaruzelski graduated from the Polish Higher Infantry School, followed by graduation from the General Staff Academy. He joined Poland's Communist party, the Polish United Workers' Party, in 1948 and became an informant for the Soviet
Solidarity (Polish trade union) regional structure, comprising 38 regions ("region") and two districts ("okręg"). At its highest, the Union had over 10 million members, which became the largest union membership in the world. During the communist era the 38 regional delegates were arrested and jailed when martial law came into effect on 13 December 1981 under General Wojciech Jaruzelski. After a one-year prison term the high-ranking members of the union were offered one way trips to any country accepting them (including Canada, the United States, and nations in the Middle East). Solidarity was organized as an industrial union, or more specifically according to the