Today is the 60th anniversary of The 228 Incident in which protests by native Taiwanese on this date in 1947 led to the wholesale execution of Taiwanese leaders by Chiang Kai-shek’s forces who occupied Taiwan after Japan’s defeat in World War II.
According to TaiwanDC.Org, in addition to those outright killed,
Thousands of others were arrested and imprisoned in the “White Terror†campaign which took place in the following decades. Many of these remained imprisoned until the early 1980s. Until the beginning of the 1990s, the events of 1947 were a taboo subject on the island. The Kuomintang did not want to be reminded of their dark past, and the Taiwanese did not dare to speak out for fear of retribution by the KMT’s secret police
Wikipedia also has a long entry about the incident and its aftermath.