So someone who believes the Federal government should only be involved in national defense, and not in education, environmental protection, labor protection, farm subsidies, health care, retirement funding, communications (including Internet), roads and highways, regulation of banks and the market, etc.
A couple of the above clearly come under the interstate commerce clause. Then there is the postal clause and the question about when the post becomes electronic. It's a shame you Americans refuse to keep your Constitution up to date.
Actually the CIA for the most part isn't bound by the Constitution. The CIA's mission is to protect American interests abroad, where the Constitution doesn't apply.
And this is the problem with America today. The Constitution obviously applied to the federal government (expanded with the 14th to all government) and the rights, except political rights such as voting, apply to "The People", not just Americans nor do those rights disappear just because someone is not in the country. Same with the restrictions, Congress is banned from creating laws limiting speech, not just limiting American speech, and all these laws about secrecy are also obviously an infringement on the 1st.
Yet keep seeing that too many Americans don't care that their government is infringing rights all over the world. Murder is murder whether it is an American citizen or not.