The seven-week-long Tiananmen Square protests and their bloody end — hundreds if not thousands of people are believed to have died — snuffed out a tentative shift toward political liberalisation.In this June 5, 1989, photo, a Chinese man stands alone to block a line of tanks heading east on Beijing's Changan Blvd. IN PIC: The iconic image later came to be known as the 'tank man.' (Photo | AP)