In one case, that of journalist Shi Tao, information turned over by Yahoo! was submitted as evidence in a trial that ended in a 10-year prison sentence. A primary  piece of evidence was a private email Mr. Shi sent to the United States from his Yahoo! email account.

We don’t really know how many voices have been silenced through Yahoo!’s collusion, or how many people have been rounded up.  What we do know, and why we need your help, is that Yahoo! cannot hide behind the supposed realpolitik of working in China

Yahoo! is not immune to public condemnation. Your demands for change will get the Internet giant’s attention.

Amnesty demands that Yahoo! use its influence to secure prisoner of conscience Shi Tao's release and to stop any actions that could undermine human rights in any country in which it operates.