Oh Kyong-sup (2005) 19 attempted to present analysis of the characteristic of PPC in North Korea through comparison between Gulags of the USSR and PPC of North Korea. He indicated that the purpose of operation of Gulag by the USSR was for mobilization of labor to increase production while the purpose of PPC in North Korea was for political tool for terrorism to eliminate political opponents. His analysis has indicated that the conditions and treatment of prisoners in Gulag was considerably better than in PPC and the Gulag was disbanded after the World War II whereas the system of PPC has been strengthened and still continuing. The study is challenged for its conclusion that the only purpose of Gulag in USSR was mobilization of labor force and the study has failed to review concentrations camps in other communism countries. The present survey study has referred to the following reports and research data on PPC: 19 Oh Kyong-sup, ““A Study on the System and Reality of NK Human Rights Violation-the Case of PPC,” paper submitted for Master Degree, Korean University, 2005 21