4·19 혁명
A growing civil uprising against the rigged election in March 1960 ended up developing into the April Revolution, and Syngman Rhee went out of his office on 26 April 1960; Rhee was pressured by the United States Government into an immediate resignation. On 15 June 1960, the Second Republic, led by Yoon Bo-seon (the 4th President of South President) and Chang Myon (the 2nd Prime Minister of South Korea), was established by the new constitution. Upon the inauguration of the new government, it was shown that there were many problems with economic climate. Eventually, the powerless and incompetent Second Republic was ended by a military government under the Supreme Council for National Reconstruction. At the instigation of the military junta, the Revolution Tribunals were established for punishing political offenders, political henchmen, illicit fortune amassers and high-ranking officials relating to armed crackdown during April Revolution.