May 21—June 23, 1972: A meeting on "criticizing Lin and rectification" in Beijing

May 21, 1927: The Hunan reactionary Kuomintang army launches a counter-revolutionary coup in Changsha, due to a public collusion between Wang Jingwei and Chiang Kai-shek

May 21, 1944: An enlarged Seventh Plenary Session of the Sixth CPC Central Committee opens in Yangjialin in Yan'an

May 21—June 12, 1961: The CPC Central Committee holds working conferences in Beijing to prepare "Regulations on Rural People's Communes"

May 21—June 23, 1972: The CPC Central Committee holds a meeting on "criticizing Lin and rectification" in Beijing