Prague Spring (1968)
The Prague Spring was a period of political liberalization and mass protest in the Czechoslovak Socialist Republic. It began on 5 January 1968, when reformist Alexander Dubček was elected First Secretary of the Communist Party of Czechoslovakia (KSČ), and continued until 21 August 1968, when the Soviet Union and most of Warsaw Pact members invaded the country to suppress the reforms.
Warsaw Pact invasion of Czechoslovakia (1968)
On 20–21 August 1968, the Czechoslovak Socialist Republic was jointly invaded by four Warsaw Pact countries: the Soviet Union, the Polish People’s Republic, the People’s Republic of Bulgaria and the Hungarian People’s Republic. The invasion stopped Alexander Dubček’s Prague Spring liberalisation reforms and strengthened the authoritarian wing of the Communist Party of Czechoslovakia (KSČ).