Immediately after the recapture of Seoul on September 28, 1950, the Rhee Syngman administration arrested and killed those who were suspected of having collaborated with North Korean forces during the North Korean occupation of South Korea in 1950. The government invoked special rules to conduct a nationwide sweep against the collaborators, which, in turn, exacerbated the internal conflicts between refugees and non-refugees. The Joint Investigation Committee (JIC) was established to arrest and investigate, with no clear legal basis, those who were suspected of having collaborated with the North. Collaborators were also considered unpatriotic and treacherous, and thus were deprived of property rights. Overall, the Rhee administration’s draconian punishment against collaborators sought their exclusion from society. At the same time, the Second National Assembly, which was strongly against the position of the Rhee administration, came into conflict with the government. The National Assembly later revised the special rules and abolished the JIC. In the end, however, the arrest and execution of suspected collaborators carried out by the Rhee Syngman administration constituted a turning point toward anticommunism after the Korean War.