 By the time of the first round of the first multi @-@ party elections , held on 22 April 1990 , there were 33 registered parties . The most relevant parties and coalitions were the League of Communists of Croatia – Party of Democratic Changes ( the renamed Communist party ) , the Croatian Democratic Union ( HDZ ) , and the Coalition of People 's <unk> ( KNS ) , which included the <unk> led by <unk> <unk> , and the HSS , which resumed operating in Croatia in December 1989 . The runoff election was held on 6 May 1990 . The HDZ , led by Franjo Tuđman , won ahead of the reformed Communists and the KNS . The KNS , led by <unk> <unk> @-@ <unk> and <unk> <unk> – who had led the Croatian Spring – soon splintered into individual parties . The HDZ maintained a parliamentary majority until the 2000 parliamentary election , when it was defeated by the Social Democratic Party of Croatia ( SDP ) , led by <unk> . Franjo <unk> , of the HDZ , was appointed prime minister to head a national unity government in July 1991 as the Croatian War of Independence escalated in intensity . His appointment lasted until August 1992 . During his term , Croatia 's declaration of independence from Yugoslavia took effect on 8 October 1991 . The HDZ returned to power in the 2003 parliamentary election , while the SDP remained the largest opposition party . 
