Re: One law for us
Yes, the CIA/NSA/Defense Intelligence Agency are (alledgedly) not allowed to gather intelligence on American citizen's activities at home in America. Domestic intelligence is the remit of the FBI/DEA/your local police However, if you are an American citizen in the U.S. but communicating overseas for whatever reason, then those communications and (supposedly) only those communications can be hoovered up by our brave boys and girls in foreign intelligence.
These days the lines have been intentionally blurred by grasping idjits who think things like "Wow! We've built this great infrastructure for snarfling up the communications of obviously devious foreigners. Imagine the good it would do if we aimed that at our own people!"