The federal government is launching an expansive program dubbed Perfect Citizen" to detect cyber assaults on private companies and government agencies running such critical infrastructure as the electricity grid and nuclear-power plants. The surveillance by the National Security Agency, the government's chief eavesdropping agency, would rely on a set of sensors deployed in computer networks for critical infrastructure that would be triggered by unusual activity suggesting an impending cyber attack. Defense contractor Raytheon Corp. recently won a classified contract for the initial phase of the surveillance effort valued at up to $100 million. Some industry and government officials familiar with the program see Perfect Citizen as an intrusion by the NSA into domestic affairs. One internal Raytheon email, the text of which was seen by The Wall Street Journal [said,] "Perfect Citizen is Big Brother." Raytheon declined to comment on this email. The information gathered by Perfect Citizen could also have applications beyond the critical infrastructure sector, officials said, serving as a data bank that would also help companies and agencies who call upon NSA for help with investigations of cyber attacks, as Google did when it sustained a major attack late last year.