Upon Hu Yaobang's death, the Tiananmen Square protests of 1989 begin in China.

Hu Yaobang
Hu Yaobang was a Chinese politician who was a high-ranking official of the People's Republic of China. He held the top office of the Chinese Communist Party (CCP) from 1981 to 1987, first as Chairman from 1981 to 1982, then as General Secretary from 1982 to 1987. After the Cultural Revolution (1966–1976), Hu rose to prominence as a close ally of Deng Xiaoping, the paramount leader of China at the time.
1989 Tiananmen Square protests and massacre
The Tiananmen Square protests, known within China as the June Fourth Incident, were student-led demonstrations held in Tiananmen Square in Beijing, China, lasting from 15 April to 4 June 1989. After weeks of unsuccessful attempts between the demonstrators and the Chinese government to find a peaceful resolution, the Chinese government deployed troops to occupy the square on the night of 3 June in what is referred to as the Tiananmen Square massacre. The events are sometimes called the '89 Democracy Movement, the Tiananmen Square Incident, or the Tiananmen uprising.