The Red Curtain (or referred by some as the Soviet Wall and formerly known as Stalin Wall) was a heavily fortified, military wall built by Soviet Union after the Great War that greatly expand across the Russian-European border. In the aftermath of the Great War, Soviet Union was on the brink of numerous unrest and turmoil, and bearing uneasy foreign relations with Western Europe. The unrest reached its peak in August 1925 when several anti-communist terrorist bombing occur within Russia. By a month later, in September, the Soviet government began the construction of the Red Curtain with barbed wires before being finally reinforced with solid concrete by 1930.Construction was later led by the Soviet Defense Mandate.