In 1968 during a big student revolt in the streets of Belgrade, he daily criticized official press coverage of the protests in front of hundreds of protesting students. For this reason he was denounced by semi-official newspaper "Politika". He was a leading anti-Marxist intellectual in Serbia during the 1970s and 1980s. In the 1970s he criticized severely Vladimir Lenin's involvement in pre-revolutionary robberies and this had powerful echo and undermined pro-Marxist intelligentsia in Yugoslavia that supported the government of Josip Broz Tito. In his 1985 book "Marxism and Jesuitism" he severely criticized Lenin and Joseph Stalin, which prompted Soviet officials to unsuccessfully demand his removal from the University of Belgrade. He continued his anti-communist involvement during the rule of Slobodan Milošević (1990–2000) and was eventually banned from entering the Faculty of Philology building in 1998 by a government-appointed dean.