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In page Solidarity (Polish trade union):

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Although Leszek Kołakowski's works were officially banned in Poland, and he lived outside the country from the late 1960s, his philosophical ideas nonetheless exerted an influence on the Solidarity movement. Underground copies of his books and essays shaped the opinions of the Polish intellectual opposition. His 1971 essay Theses on Hope and Hopelessness, which suggested that self-organised social groups could gradually expand the spheres of civil society in a totalitarian state, helped inspire the dissident movements of the 1970s that led to the creation of Solidarity and provided a philosophical underpinning for the movement.[citation needed]