heavy industrialization In the late 1950s, Slovenia was the first of the Yugoslav republics to begin a process of relative pluralization. A decade of industrialisation was accompanied also by a fervent cultural and literary production with many tensions between the regime and the dissident intellectuals. From the late 1950s onward, dissident circles started to be formed, mostly around short-lived independent journals, such as Revija 57 (1957–1958), which was the first independent intellectual journal in Yugoslavia and one of the first of this kind in the Communist bloc, and Perspektive (1960–1964). Among the most important critical public intellectuals in this period were the sociologist Jože Pučnik, the poet Edvard Kocbek, and the literary historian Dušan Pirjevec. 1960s: "Self-management" By the late 1960s, the reformist faction gained control of the Slovenian Communist Party, launching a series of reforms, aiming at the modernization of Slovenian society and economy. A new economic policy, known as workers self-management started to be implemented under the advice and supervision of the main theorist of the Yugoslav Communist Party, the Slovene Edvard Kardelj. 1970s-1980s: "Years of Lead" In 1973, this trend was stopped by the conservative faction of the Slovenian Communist Party, backed by the Yugoslav Federal government. A period known as the "Years of Lead" (Slovene: svinčena leta) followed. During this period, censorship and repression of the press and artists increased, while freedom of speech declined. Many people were jailed because of their political beliefs. 1980s: Towards independence In the 1980s, Slovenia experienced a rise of cultural pluralism. Numerous grass-roots political, artistic and intellectual movements emerged, including the Neue Slowenische Kunst, the Ljubljana school of psychoanalysis, and the Nova revija intellectual circle. By the mid-1980s, a reformist fraction, led by Milan Kučan, took control of the Slovenian Communist Party, starting a gradual reform towards a market socialism and controlled political pluralism. The Yugoslav economic crisis of the 1980s increased the struggles within the Yugoslav Communist regime regarding the appropriate economic measures to be undertaken. Slovenia, which had less than 10% of overall Yugoslav population, produced around a fifth of the country's GDP and a fourth of all Yugoslav exports. The political disputes around economic measures was echoed in the public sentiment, as many Slovenes felt they were being economically exploited, having to sustain an expensive and inefficient federal administration. In 1987 and 1988, a series of clashes between the emerging civil society and the Communist regime culminated