The first political party founded in Croatia since the beginning of the Communist rule was the Croatian Social Liberal Party (HSLS), established on 20 May 1989, followed by the Croatian Democratic Union (HDZ) on 17 June 1989. In December, Ivica Račan became the head of the reformed Communist party. At this time, the Communist party decided to cancel political trials, release political prisoners and endorse a multi-party political system. The Civil Organisations Act was formally amended to allow multiple political parties on 11 January 1990, legalising the new parties. By the time of the first round of the first multi-party elections, held on 22 April 1990, there were 33 registered parties. There were single-seat constituencies for half of the seats and a single nationwide constituency (through election lists) for the remaining seats. Still, the most relevant parties and coalitions were the renamed Communist party (the League of Communists of Croatia — Party of Democratic Changes), the HDZ and the Coalition of People's Accord (KNS), which included the HSLS, led by Dražen Budiša, and the HSS, which resumed operating in Croatia in December 1989. The runoff election, open to any candidate receiving at least 7% of the vote, 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 the former leaders of the Croatian Spring (Savka Dabčević-Kučar and Miko Tripalo), soon splintered into individual parties. On 8 October 1991, Croatia's declaration of independence took effect. The HDZ maintained a parliamentary majority until the 2000 parliamentary elections when it was defeated by the SDP led by Račan. The HDZ returned to power in the 2003 elections, while the SDP remained the largest opposition party.