Dr. Xu Zerong, (anglicized name, Dr. David Tsui) an associate research professor at the Provincial Academy of Social Sciences and an affiliated professor at Zhongshan University, Xu wrote several freelance articles for Hong Kong publications and co-founded a Hong Kong-based journal, China Social Sciences Quarterly. He was detained in 2000 and was arrested in 2002 after using historical materials for his academic research on the Korean War. He was sentenced to a total of 13 years in prison: 10 years for revealing state secrets by sending allegedly classified documents overseas, and an additional 3 years in prison for economic crimes, on charges of bringing banned books into the mainland. More information about is case is available at human rights watch. 

We are happy to report that as a result of a five month sentence reduction in combination with previous sentence reductions, Dr. Xu was released from prison on June 23, 2011.