Wu went to prison for 19 years in China for speaking out against the Chinese Communist Party and has been researching the Chinese prison system since he was released in the 1980s.
Wu helped ABC News "Primetime Live" investigate the harvesting of organs of executed prisoners in the late 1990s, which put the sale of organs from executed prisoners on the U.S. government's radar for the first time.
"I could have been killed in the prison, but I survived," said Wu. "We have to keep fighting for basic human rights in China."