April 5, 1927: Wang Jingwei and Chen Duxiu issue a "Joint Declaration"

The Declaration said the CPC and the KMT would cooperate, but the declaration of friendship disguised the counter-revolutionary ambitions of Chiang Kai-shek.

April 5, 1956: The CPC issues a report on Soviet Union's "dictatorship of the proletariat"

The report analyzed the history and errors made by the Soviet Union's ruling party under the condition of the "dictatorship of the proletariat" and the phenomenon of Stalin's personality cult.

April 5, 1956: The "April 5 Tian'anmen Incident"

The incident the traditional day of mourning, the Qingming Festival, was triggered by the death of Premier Zhou Enlai earlier that year. The public strongly disapproved of the removal of the displays of mourning, and began gathering at Tian’anmen Square to protest against the Gang of Four, who ordered the Square to be cleared.

April 5, 1978: The CPC Central Committee approves the United Front Work Department and the Ministry of Public Security's report on "taking off the hat" of all rightists

April 5, 1983: The Chinese People's Armed Police Force establishes its headquarters in Beijing