Twenty-five years ago today, China's Tiananmen Square protests ended in a massacre. The first demonstrators – students and hunger-strikers – were joined by workers and people from all walks of life until they filled the vast square, and the protests spread across hundreds of Chinese cities. In late May, 1989, after the government declared martial law and ordered the military to use deadly force, some protesters in Beijing attacked army convoys and burned vehicles as the military moved through the city. On June 3 and June 4, the Chinese military horrified the world by opening fire on the unarmed civilians. After the massacre, the government arrested thousands of people on “counter-revolution” and other charges.