Sorry, I did not mean to imply that taxation is necessary for surveillance.
What I'm proposing is that regulation is one way of legitimizing the role of surveillance. The government has a reason to be involved by virtue of the fact that it's made regulations.
I did a bad job in conveying that idea above. It's certainly possible my analysis is utterly incorrect as well.
Public safety and homeland security are primary functions of the FCC. When government decides to censor, surveil, or manipulate information in the future it seems likely it will be instrumented through the FCC as that relationship was used to do the same for radio and television in the past.