This article doesn't say what the six organizations were, which is the main contention of settlement (the fact that it was going to them, not what they are). But in case you were curious: AARP, World Privacy Forum, Carnegie Mellon University, Chicago-Kent College of Law, Harvard University and Stanford Law School.
Here is an article about when the Supreme Court kicked the case back to the Appellate court earlier this year, which goes a bit deeper into the legal issues behind it: https://www.geekwire.com/2019/seattle-area-att-employees-bri...