The history of the Chinese Communist Party began with its establishment in July 1921. A study group led by Peking University professors Chen Duxiu and Li Dazhao to discuss Marxism, led to intellectuals officially founding the Chinese Communist Party (CCP) in July 1921. In 1923, Sun Yat-sen invited the CCP to form a United Front, and to join his Nationalist Party (GMD) in Canton for training under representatives of the Comintern, the Soviet Union's international organization. The Soviet representatives reorganized both parties into Leninist parties. Rather than the loose organization that characterized the two parties until then, the Leninist party operated on the principle of democratic centralism, in which the collective leadership set standards for membership and an all powerful Central