I'm pretty sure that other anti-trust cases are pursued by the federal government. If so, do you know whether it's still possible for the terms of settlement arising from such suits to be sealed?
Back in 2010 the U.S. Department of Justice entered into a settlement of the government's claims against Adobe, Apple, Google, Intel, Intuit, and Pixar. The proposed agreed final judgment, which I believe was approved by the court substantially as-is, is at http://www.scribd.com/doc/38096460/Settlement-in-tech-hiring.... The settlement imposed some restrictions on the companies' hiring practices, but those restrictions included significant carve-outs, some of which I discussed at http://www.oncontracts.com/dojs-employee-solicitation-consen....
This particular case was pursued by the government. The companies settled with the DOJ: http://www.justice.gov/atr/cases/f272300/272393.htm. See: http://www.mintz.com/newsletter/2011/Advisories/0858-0111-NA....
The DOJ has a policy against entering into confidential settlement agreements: http://www.law.cornell.edu/cfr/text/28/50.23. While it is in theory legal for them to do so, this regulation makes any such attempt potentially subject to litigation.