NSA surveillance is a complex subject - legally, technically and operationally.

The NSA is forbidden to 'target' American citizens, green-card holders or companies for surveillance without an individual warrant from a judge.

As digital communications have multiplied, and NSA capabilities with them, the agency has shifted resources from surveillance of individual targets to the acquisition of communications on a planetary scale.

I have no evidence of any relationship between IRS and NSA.

The NSA has different reporting requirements for each branch of government and each of its legal authorities.

The NSA's business is 'information dominance,' the use of other people's secrets to shape events.