Iron Curtain, the political, military, and ideological barrier erected by the Soviet Union after World War II till end of Cold War, to seal off itself and its dependent eastern and central European allies from open contact with the West and other noncommunist areas.
British prime minister Winston Churchill used the term in a speech at Fulton, Missouri, U.S., on March 5, 1946, when he said of the communist states, "From Stettin in the Baltic to Trieste in the Adriatic, an iron curtain has descended across the Continent."
Although the construction of the Berlin Wall in 1961 restored them. The Iron Curtain largely ceased to exist in 1989-90 with the communists' abandonment of one-party rule in eastern Europe.