This paper discusses the evolution of the position and role of the prosecutor in the course ofshaping the institution of penitentiary supervision. Penitentiary supervision is the process of examining (controlling) the activities of the bodies established to carry out isolation measures, combined with the possibility of assistance, influence and modification of this activity. In the past, the scope of the prosecutor’s influence on the functioning of the broadly understood criminal justice system was much greater. The evolution from prosecutor supervision, through prosecutor–court supervision, to the current model of only judicial supervision, is an interesting example of a clash between two competing participants in criminal proceedings. Jud...