This is NOT necessarily a Google problem, other than their cookies being the venue for the tracking. If the mod feels this should be moved elsewhere ...
The National Security Agency is secretly piggybacking on the tools that enable Internet advertisers to track consumers, using "cookies" and location data to pinpoint targets for government hacking and to bolster surveillance.
The agency's internal presentation slides, provided by former NSA contractor Edward Snowden, show that when companies follow consumers on the Internet to better serve them advertising, the technique opens the door for similar tracking by the government. The slides also suggest that the agency is using these tracking techniques to help identify targets for offensive hacking operations.
This is not restricted to visiting G properties. It has been determined the cookies concerned originate from G's anti-virus/malware services, which many browsers have turned on by default. This can result (in one quoted case) in a browser that has never gone online STILL getting the PREFS cookie set.