iron curtain

impenetrable barrier; line of demarcation between Western Europe and the Russian zone of influence; political and ideological barrier that cuts off and isolates an area (especially as the Soviets did with their satellite states)

The "Iron Curtain" was the boundary which symbolically, ideologically, and physically divided  Europe into two separate areas from the end of World War II until the end of the Cold War, roughly 1945 to 1991. The first recorded use of the term was in 1920 by Ethel Snowden in her book Through Bolshevik Russia. German politician and Nazi Minister of Propaganda Joseph Goebbels was the first to refer to an "Iron Curtain" coming down across Europe after World War II, in a manifesto he published in the German newspaper Das Reich in February 1945. The term was not widely used until March 5, 1946, when it was popularized by Winston Churchill in his "Sinews of Peace" address.
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Noun
1. an impenetrable barrier to communication or information especially as imposed by rigid censorship and secrecy; used by Winston Churchill in 1946 to describe the demarcation between democratic and communist countries
(hypernym) ideological barrier

Synonyms and related words:
Berlin wall, Bolshevism, Castroism, Communist Information Bureau, Communist Party, Maoism, Marxian socialism, Marxism, Marxism-Leninism, Pillars of Hercules, Stalinism, Titoism, Trotskyism, arch dam, backstop, bamboo curtain, bank, bar, barrage, barrier, barrier of secrecy, bear-trap dam, beaver dam, blackout, boom, border, border ground, borderland, breakwater, breastwork, brick wall, buffer, bulkhead, bulwark, censorship, cofferdam, communism, curtain, dam, defense, democratic centralism, dialectical materialism, dike, ditch, earthwork, embankment, fence, frontier, frontier post, gate, gravity dam, groin, hush-up, hydraulic-fill dam, ironbound security, jam, jetty, leaping weir, levee, logjam, march, marches, marchland, milldam, moat, mole, mound, oath of secrecy, official secrecy, outpost, outskirts, pall, parapet, portcullis, rampart, repression, revisionism, roadblock, rock-fill dam, seal of secrecy, seawall, security, shutter dam, smothering, stifling, stone wall, suppression, three-mile limit, twelve-mile limit, veil, veil of secrecy, wall, weir, wicket dam, work, wraps
  

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