The author of this paper utilizes published and unpublished archival documents, periodicals from the time and other relevant scientific literature to analyse political situation in the Glina Municipality in the 1990 and 1991, precisely, from the beginning of democratic changes in 1989 to June 26th 1991 when the police station in Glina was attacked by Serb forces. After the first democratic elections in the spring of 1990 communists took power over the municipality, mostly because of Serb voters who wanted to preserve socialist Yugoslavia. The Croats have chosen nationalist and democratic parties to represent them in order to create independent democratic state of Croatia. In time, Serbs in the Glina Municipality lost their trust in communists and turned to greater-serbian policy of Knin and Belgrade whose final goal was annexation of Croatian territory, therefore the Glina Municipality, and acquisition to the Republic of Serbia. From spring 1990 to February 1991 Glina Municipality had a political crisis caused by the policy of Serb Democratic Party (SDS) which operated against the constitution and laws of the Republic of Croatia. In that period executive authority of the municipality hasn't been elected so new elections were announced. SDS won it and took Glina Municipality to illegal Serbian Autonomous District (SAO) Krajina, which didn't acknowledge the Croatian government in Zagreb, but wanted to unite with the Republic of Serbia. In the summer of 1991 started the war for Glina and other Croatian territory.