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.
In Europe after World War II, the symbolic boundary between capitalist West and communist East during the Cold War. The term was popularized by the UK prime minister Winston Churchill from 1945.
An English traveler to Bolshevik Russia, Ethel Snowden (1881–1951), used the term with reference to the Soviet border in 1920. The Nazi minister Goebbels used it a few months before Churchill in 1945 to describe the divide between Soviet-dominated and other nations that would follow German capitulation.