From MSNBC (link):

The woman who heckled Chinese President Hu Jintao during a White House ceremony last week says her action was a matter of life and death.

Wang Wenyi said Wednesday she could not pass up an opportunity to confront Hu and President Bush over claims that China is removing organs from living members of the Falun Gong spiritual movement and selling them.

China vehemently denies the accusations. The State Department has said it takes the charges seriously but has found no evidence they are true.