Your right to associate freely
chilled by NSA's pocket spies
The Electronic Frontier Foundation on your ever-present companion, the co-traveling NSA:

The CO-TRAVELER program is based on guilt by association, tracking location to determine our relationships and where we meet. The First Amendment protects our right to associate with individuals and groups without disclosing that information to the government. This is an essential right because it allows people to discuss their ideas, concerns, and feelings with others without the shadow of government surveillance. And this is not just a right recognized in the United States: the right to freely associate with individuals or groups has also been recognized in the UN Universal Declaration of Human Rights, the European Convention on Human Rights, and in countless other human rights charters.

https://www.eff.org/deeplinks/2013/12/meet-co-traveler-nsas-cell-phone-location-tracking-program