An undated photo provided by Voice of America shows Chinese dissident Liu Xiaobo, who won the 2010 Nobel Peace Prize. He was jailed in 2008 for promoting human rights. An amendment in Congress proposes renaming the street in front of the Chinese Embassy in Washington, D.C., in his honor. AP hide caption

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An empty lab used by China Enriching Chemistry, which was accused of shipping illegal drugs to the U.S. Eric Chang, the company's director, is currently in jail in China, where he was charged with producing ecstasy. Frank Langfitt/NPR hide caption

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Chinese paramilitary police stand guard in Tiananmen Square in Beijing on June 4, the 25th anniversary of a violent crackdown on protesters by Chinese troops. Kevin Frayer/Getty Images hide caption

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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

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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

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Foster worked as a sociology professor at Guangdong University of Foreign Studies in southern China for a total of five years before he was charged with theft and sent to jail. Courtesy of Stuart Foster hide caption

itoggle caption Courtesy of Stuart Foster