The fundamental aim of the article is the review of the radicalism manifestation within the social resistance in Poland in the context of the Czechoslovak 1968 events, their range, forms and intensity. The legislative acts and structures eradicating that type of occurrence are described briefly. The Russian intervention in Czechoslovakia in summer 1968, and also the escalation of social resistance in Poland since the beginning of the year, increased the radicalisation of protests. The so-called „Poronin operation” or the act of self-immolation of Ryszard Siwiec during the harvest festival in 1968 were the well known sings of protest of that period. The article outlines the radical forms of resistance in Poland in 1968 and, at the same time, it is an attempt at a careful reconstruction of the discussed matter. It was written on the basis of the archive records (MSW PRL Ministry of Interior and Administration documentation from Warsaw Institute of National Remembrance), literature, press and other sources.