The purge of communists led by Chiang Kai-shek on April 12, 1927 (often called the Shanghai Massacre), referred to as a counter-revolutionary coup or massacre in PRC literature.

counterrevolutionary coup of 12th April 1927, Chiang Kai-shek's coup against the communists in Shanghai

The massacre and coup in Shanghai on April 12, 1927, led by Chiang Kai-shek against the Chinese Communist Party.