from the unknowncountry.com newsletter:
Yahoo has been accused of turning over information to the Chinese police that has led to the imprisonment of a Chinese reporter for ten years, for allegedly transmitting state secrets abroad.
The reporter, Shi Tao, transmitted information about an official document outlining media restrictions ahead of the 15th anniversary of the 1989 Tiananmen Square massacre, according to Reporters Without Borders.
According to Reporters Without Borders, Yahoo is known to collaborate with China in tracking down dissidents, and fully co-operates with Chinese authorities in giving them full access to supposedly private material on Yahoo's Chinese sites.
The company collaborates with this totalitarian regime because China is a lucrative market
read more about it here