Here’s some background: AT&T over-prices some of the equipment it was selling to schools (schools!). The FCC investigates. AT&T’s competitors file a FoIA to make the investigation’s findings public. AT&T claims the FoIA request is a violation of their personal privacy. The SCOTUS denies their right to personal privacy. AT&T and other corporations join the ranks of the rest of us “persons” who are given no right to personal privacy in the US.
It’s worth remembering that this is the very same AT&T that denies their own customers a right to personal privacy. From SFGate.com, waaaaaay back in 2006:
The policy also indicates that AT&T will track the viewing habits of customers of its new video service — something that cable and satellite providers are prohibited from doing … The company’s policy overhaul follows recent reports that AT&T was one of several leading telecom providers that allowed the National Security Agency warrantless access to its voice and data networks as part of the Bush administration’s war on terror.