The Prague Spring is a period of political liberalization and mass protests in the Czechoslovak Socialist Republic, which began on January 5 with the election of Alexander Dubček as the first secretary of the Communist Party of Czechoslovakia. It continued until August 21, 1968, when the Soviet Union and most of the Warsaw Pact members intervened militarily in the country to suppress the reforms. The reforms of the Prague Spring were a strong attempt by Dubček to provide the citizens of Czechoslovakia with additional rights in the act of partial decentralization of the economy and democratization. After the invasion, Czechoslovakia entered a period known as normalization, in which Gustáv Husák reversed almost all reforms. As a reaction to the Soviet military intervention, the development of Eurocommunism took place in Europe, which works opposite to the Soviet Union, i.e. within a democratic way. Its goal, as the complete opposite of the Soviet model, is a program of a peaceful and democratic transition to socialism. The Croatian Spring is a reform period in Croatian history that begins at the end of the 1960s and ends at the beginning of the 1970s. The causes of that period were three factors: the issue of the economy, the issue of nationality and equality, and the issue of language and identity. In the 60s of the last century, the economy of Yugoslavia was affected by an economic crisis, and Serbs predominated in companies in Croatia, as well as in the party leadership in general. The issue of the Croatian language was tried to be resolved by the Novi Sad agreement and the creation of a common Serbo-Croatian orthography that did not contain Croatian terminology. All these factors together influenced the creation of the Croatian national movement. The Croatian Spring had three centers: reformists within the Central Committee of the SKH, intellectuals and scientists gathered around Matica hrvatska in Zagreb, and Zagreb students and their movement. They worked together with the goal of reforming the Federation, in order to democratize it and to introduce self-governance. However, the emergence of political opposition, and thus the emergence of national sentiment among the people, was not approved by the communist regime. Soon the Croatian Spring was suffocated by the purge of the Croatian political leadership in Karađorđevo.