This chapter addresses whether criminological criticism can constitute an actual intervention in social reality. The key factor that links critical criminological research to harm reduction is the explanation of the cause or causes of the harm. Regardless of whether the practice of policy critical criminology is the most effective way of reducing harm in reality, it is certainly the most direct. Also likely to be effective, albeit indirectly, is public critical criminology, in which critical criminologists influence the public who, in turn, influence the policies pursued by the public, third, or private sectors at local, regional, national, or global levels. The chapter then establishes a model of collaboration by means of which the criminological critic and the critical criminologist can both contribute to the actual reduction of harm in practice.