This paper deals with the legal mechanism of assembly and demonstration in Korea. While focusing on the US Army Military Government in Korea (USAMGIK, 1945-1948), it shows that Proclamations had two dimensions: elevating human rights and pacifying Korean situation. Thus, the USAMGIK annulled two notorious colonial laws: Act on Punishing Political Convicts (1910) and Peace Preservation Law (1925), acts that were not threatening to the USAMGIK. However, other important laws on assembly such as Security Law (1908), Act on Assembly (1910), and Act on Provisional Security Law (1941) were intact by the end of USAMGIK era. Those laws provided police with arbitrary power to allow assembly. As is well known, through 1946-47, the left wings...