The Abstract This diploma thesis discusses three lawsuits at the period of normalization, when participants were sued and later sentenced for provocation and denigration of the Czechoslovak Socialistic Republic and its representatives during their theatre activity or improvisation with theatrical elements. The first from three lawsuits had been taking place during 1971 and 1972 in Ostrava. There was a parody of the novel called Son polka by Valentin Katajev put on stage in the Waterloo Theatre in 1969. The production was banned after several repetitions. Some participants were involved in producing the Tramp magazine which was unwanted and watched by the state authority. There was and editorial board organized by this magazine like a tramp party where besides other songs Son polka's songs were sung. Shortly after those events the members from the Waterloo Theatre: Petr Podhrázký, Ivan Binar, Josef Frais, Petr Ullmann, Edvard Schiffauer a Tomáš Sláma were arrested and sentenced to jail. The second case took place in Kroměříž in 1974. A group of friends led by an amateur puppeteer Emil Hauptmann had staged an improvised presentation during the Hostýn pilgrimage. Playing the puppets Emil Hauptmann committed lots of utterances which were considered as provocations according to an actual penal code and that is...