How did Soviet control of eastern Europe strengthen Pius XII’s anticommunism?

Soviet control over eastern and central Europe following World War II directly fueled Pope Pius XII’s fervent anticommunism. His concerns were realized as the Soviet Union expanded its influence, leading to the imprisonment of prominent church figures, such as Cardinal József Mindszenty of Hungary and Cardinal Stefan Wyszyński of Poland.1

Fearing that communist totalitarianism would spread into Germany and Italy, Pius XII took several decisive actions:

• Political Intervention: He encouraged Catholic Action to participate in parliamentary politics and supported the Italian Christian Democratic Party to counter the extreme left.1
• Ecclesiastical Sanctions: In 1949, he authorized the Holy Office to excommunicate Catholics who joined or collaborated with communists, whom he labeled as "godless".1
• Western Integration: He endorsed postwar western European integration as a bulwark against the expansion of communism into the region.1

These actions marked a shift from his wartime policy of diplomatic impartiality to a period of active, ideological opposition to the Soviet bloc.12