 Complete the following phrase:  Until the fall of communism, the armys 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 19811982. The LWP also took part in the suppressing of the 1968 democratization process of Czechoslovakia, commonly known as the 