AbstractFew attempts have previously been made systematically to define or interrelate the concepts of political crime, political criminal, political justice, and political prisoner. To establish a more adequate conceptual base for research, political crime and political criminals are herein defined in terms of motiwtions underlying criminal acts, regardless of the nature of the acts themselves; political justice is defined in terms of the state's reaction to perceived threat; and political prisoners are defined as those incarcerated because of either political crime (politico1 criminals) or political justice (victims of repression). Dimensions for a taxonomy of political crime are suggested.