obtaining any other academic post. He came to the conclusion that the totalitarian cruelty of Stalinism was not an aberration but a logical end-product of Marxism, whose genealogy he examined in his monumental Main Currents of Marxism, his major work, published in 1976 to 1978. Kołakowski became increasingly fascinated by the contribution that theological assumptions make to Western culture and, in particular, modern thought. For example, he began his Main Currents of Marxism with an analysis of the contribution that various forms of ancient and medieval Platonism made, centuries later, to the Hegelian view of history. In the work, he criticized the laws of dialectical materialism for being fundamentally flawed and found some of them being "truisms with no specific Marxist content", others "philosophical dogmas that cannot be proved by scientific means" but others being just "nonsense". Kołakowski defended the role which freedom of will plays in the human quest for the transcendent. His Law of the Infinite Cornucopia asserted a doctrine of status quaestionis: for any given doctrine that one wants to believe, there is never a shortage of arguments by which one can support it. Nevertheless, although human fallibility implies that we ought to treat claims to infallibility with scepticism, our pursuit of the higher (such as truth and goodness) is ennobling. In 1968, Kołakowski became a visiting professor in the Department of Philosophy at McGill University in Montreal and in 1969 he moved to the University of California, Berkeley. In 1970, he became a senior research fellow at All Souls College, Oxford. He remained mostly at Oxford, but he spent part of 1974 at Yale University, and from 1981 to 1994, he was a part-time professor at the Committee on Social Thought and in the Department of Philosophy at the University of Chicago. Although the Polish Communist authorities officially banned his works in Poland, underground copies of them influenced the opinions of the Polish intellectual opposition. His 1971 essay Theses on Hope and Hopelessness (full title: In Stalin's Countries: Theses on Hope and Despair), which suggested that self-organized social groups could gradually expand the spheres of civil society in a totalitarian state, helped to inspire the dissident movements of the 1970s that led to Solidarity and eventually to the collapse of Communist rule in Eastern Europe in 1989. In the 1980s, Kołakowski supported Solidarity by giving interviews, writing and fundraising. Kołakowski maintained throughout his life and career