 Once in power, the Communists introduced a single-party political system, in which the Communist Party of Yugoslavia was the ruling party and the Communist Party of Croatia was its branch.In 1971, the Croatian national movement, which sought greater civil rights and the decentralisation of the Yugoslav economy, culminated in the Croatian Spring, which was suppressed by the Yugoslav leadership.In January 1990, the Communist Party fragmented along national lines; the Croatian faction demanded a looser federation.