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In page Jeju uprising:

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There are controversies about the legality of martial law, which took effect on November 17, 1948. One side believes it was illegal according to the first constitution of South Korea. The other side argues that martial law from the Japanese colonial era still existed and therefore permitted any violence effectuating martial law.[1] This part continued before August 15, 1948, and after the formation of the South Korean government.[citation needed]