Many in the West reacted negatively when Google kowtowed to the Chinese government's demands to censor its Chinese search engine Google.cn. At the time Google said that it would monitor conditions in the country and make adjustments in policy as necessary.
Looks like that time has come.
Agents who may have been working on behalf of the the Chinese government have apparently attempted a coordinated hacking attack against Google and over a dozen other major corporations. In Google's case it seems like the purpose was to access email accounts of suspected anti-government activists.
In light of this situation Google has chosen to stop self-censoring its search engine results, and may very well have to shut down it's China operations.
Read the official Google press release here.