From the Communist coup d'état in February 1948 to the Velvet Revolution in 1989, Czechoslovakia was ruled by the Communist Party of Czechoslovakia (Czech: Komunistická strana Československa, KSČ). The country belonged to the Eastern Bloc and was a member of the Warsaw Pact and of Comecon. During the era of Communist Party rule, thousands of Czechoslovaks faced political persecution for various offences, such as trying to emigrate across the Iron Curtain.