In 1964, he began to study history at Warsaw University. A year later he was suspended because he disseminated an open letter to the members of Polish United Workers' Party (PZPR) among his schoolmates. Its authors, Jacek Kuroń and Karol Modzelewski appealed for a beginning of reforms which would repair the political system in Poland. In 1965, the PZPR forbade the printing of his works. In 1966, he was suspended for the second time for organizing a discussion meeting with Leszek Kołakowski, who was expelled from the PZPR several weeks earlier, for criticizing its leaders. From then on, he wrote under a pseudonym to several newspapers including "Życie Gospodarcze", "Więź", and "Literatura".