On May 27, 1960, the DP government was overthrown by military group called the National Unity Committee, led by General Cemal Gürsel. The military feared that the founding principles of the Turkish Republic were being eroded, and there was growing public dissatisfaction with Menderes' perceived intolerance of criticism. The military junta stayed in power for the next eighteen months, trying several top DP leaders for unconstitutional rule and high treason. Three of them, including Menderes, were executed. Five others, including Bayar, were sentenced to life imprisonment. The party was officially suppressed on September 29, 1961.