The Electronic Privacy Communications Act of 1986 is supposed to protect electronic communication.
VOA: standard.2010.06.22
The Stop Online PrivacyAct (SOPA) and the Protect IP Act (PIPA) have reasonable intents, but are singularly poorly constructed, seemingly drafted because the Digital Millennium Copyright Act was not producing the intended effect.
In 1986, The Electronic Communications PrivacyAct updated federal wiretapping law in an effort to protect the Fourth Amendment rights of cell phone users.
Specific federal laws that folks tend to get these companies on are the Electronic Communications Act, the Wiretap Act and the Stored Communications Act all laws designed to protect the privacy of your communications.