Attention Tom Clancy. An investigation by the security firm Mandiant found that many of the attacks on American corporations and government agencies are coming from a clandestine People’s Liberation Army base on the outskirts of Shanghai. The group is known as the "Comment Crew" for the hidden notes it embeds into Web pages. Perhaps the most alarming part of the report is that the group, no longer focused on stealing intellectual property from corporations and military contractors, has been trying to gain access to critical infrastructure, hacking a company that designs software for oil pipelines and power grids.