Until the fall of communism, the army's prestige under communist rule continued to fall, as it was used by the government to resettle ethnic minorities immediately after the war (Operation Vistula), and to violently suppress opposition several times, during the 1956 Poznań protests, the 1970 Polish protests, and during martial law in Poland in 1981–1982. The LWP also took part in the suppressing of the 1968 democratization process of Czechoslovakia, commonly known as the Prague Spring. That same year Marshal of Poland Marian Spychalski was asked to replace Edward Ochab as chairman of the Council of State, and General Wojciech Jaruzelski, at that time the Chief of the General Staff, was named to replace him. Jaruzelski, a known Soviet loyalist, was put in place by the Soviets in order to ensure that a trusted group of officers was in control of one of the least trusted armies in the Warsaw Pact.