Protection of Czechoslovak borders during the Cold War

The protection of borders between the Czechoslovak Socialist Republic (ČSSR) and several of the Western Bloc countries of Western Europe, namely with Germany and Austria, in the Cold War era and especially after 1951, was provided by special troops of the Pohraniční Stráž (lit. 'the Border Guard') and a system of engineer equipment which created the real "Iron Curtain". The purpose was to prevent citizens of the Eastern Bloc escaping to the West, although official reports stated it was to keep the enemy's spies and saboteurs out of Czechoslovakia.

Source: Wikipedia — Protection of Czechoslovak borders during the Cold War (CC BY-SA 4.0)