You violate some law online (knowingly or unknowingly, doesn't matter), and the NSA records it and flags it for later review based on some pattern matching. Upon review, it gets forwarded (at the discretion of an agent who will make his determination with little oversight) to an embedded CIA agent in your local PD. Forbidden from operating against you themselves by federal law, they inform the local PD of the problem and you get a SWAT team at your house at 2am.
I don't think we are there yet, but I'm actually not convinced that the average American will see this as a problem - after all, they have nothing to hide.