Former Army intelligence analyst Bradley Manning, found guilty of espionage and theft Tuesday, could face a lengthy prison sentence. A penalty hearing for Manning begins today. Saul Loeb/AFP/Getty Images hide caption

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An activist wears pictures of leakers Edward Snowden and Bradley Manning during a demonstration against the electonic surveillance tactics of the NSA, in Berlin on Saturday. Sean Gallup/Getty Images hide caption

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Russian supporters of NSA leaker Edward Snowden rally in central Moscow on July 12. Russia says it won't extradite Snowden to the United States, but it has cooperated with other countries in the past. Evgeny Feldman/AFP/Getty Images hide caption

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Edward Snowden, seen during a video interview with The Guardian. Glenn Greenwald/Laura Poitras/EPA/Landov hide caption

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Lee Harvey Oswald, the assassin of President Kennedy in 1963, had defected to the Soviet Union several years earlier, but returned to the U.S. after becoming disillusioned with that country. He is shown here in a Dallas police station after his arrest for Kennedy's shooting. AP hide caption

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Edward Snowden, center, at Moscow's Sheremetyevo Airport on July 12. At left is WikiLeaks' Sarah Harrison. Courtesy of Human Rights Watch hide caption

itoggle caption Courtesy of Human Rights Watch