Mourners shout opposition slogans during a funeral mass honoring the Cuban activist Oswaldo Paya in Havana, Cuba, Monday, July 23, 2012. Paya, who spent decades speaking out against the communist government of Fidel and Raul Castro and became one of the most powerful voices of dissent against their half-century rule, died Sunday in a car crash. He was 60. (AP Photo/Ramon Espinosa) Ramon Espinosa / AP

Friends and family of the late Cuban activist Oswaldo Paya carry his flag draped coffin during his burial at a cemetery in Havana, Cuba, Tuesday, July 24, 2012. Paya, 60, gained international fame as the lead organizer of the Varela Project, a signature-gathering drive asking authorities for a referendum on guaranteeing rights such as freedom of speech and assembly. The initiative launched a decade ago was seen as the biggest nonviolent campaign to change the system Fidel Castro established after the 1959 Cuban revolution. Paya died on Sunday, July 22, 2012 in a car crash. (AP Photo/Ramon Espinosa) Ramon Espinosa / AP