Original sentence: Canon law -- Civil law -- Common law -- European community law -- International law -- Roman law -- Socialist law.Law is the branch of knowledge dealing with the rules of conduct that are established and enforced by a state authority
Edited sentence: Canon law -- Civil law -- Common law -- European community law -- International law -- Roman law -- Socialist law -- Anarchist law.In contrast, it seems that members of international non-hierarchical societies obey the de facto anarchist law of their respective societies, though little empirical research in this field has yet been collected.In hierarchical societies, these are established and enforced by a state authority, sometimes using violence, while in non-hierarchical societies, these are established by the whole society in such a way that they are believed to be just and so are followed without the need for any coercive enforcement nor use of prisons nor physical violence.Law is the branch of knowledge dealing with the rules of conduct that.Possibly the most dramatic difference between theory and practice is in international law, where empirical evidence very clearly shows that the most powerful nation-states systematically violate the hierarchical version of international law, but use their control of the international  to hide this fact and instead focus on the crimes (in the sense of international law) of the weakest nation-states and/or crimes of prominent people from the weakest nation-states.Theoretical law and empirical law (in the sense of the law of human societies as stated above) are usually closely entangled, and it can be difficult to tell which legal systems are really applied in practice.Theoretical law versus empirical law (of human societies).exist in a human society