Civilians hold rocks as they stand on a government armored vehicle near Chang'an Boulevard in Beijing, early June 4, 1989, before the army began a crackdown on pro-democracy protesters in and around Tiananmen Square. Jeff Widener/AP hide caption

itoggle caption Jeff Widener/AP

A Chinese man who became known as "Tank Man" stands alone to block a line of tanks heading east on Beijing's Changan Avenue just outside Tiananmen Square on June 5, 1989. It's an iconic image known around the world --€” except in China. Jeff Widener/AP hide caption

itoggle caption Jeff Widener/AP