 Dui Hua's prisoner-advocacy work began as an effort to uncover the names and secure the early release of activists imprisoned during the massacre of the pro-democracy demonstrators on June 4, 1989 in Tiananmen Square.Over the years, Dui Hua's scope has broadened to encompass research and advocacy relevant to individuals detained in China for the non-violent expression of their freedom of speech and association.Dui Hua maintains a secure Political Prisoner Database with information on more than 35,000 political and religious prisoners incarcerated in China since 1980.