From the Wired article, "Instead of going for the easy bust, the FBI spent a solid year surveilling McGrath, while working with Justice Department lawyers on the legal framework for what would become Operation Torpedo. Finally, on November 2012, the feds swooped in on McGrath, seized his servers and spirited them away to an FBI office in Omaha.
A federal magistrate signed three separate search warrants: one for each of the three hidden services. The warrants authorized the FBI to modify the code on the servers to deliver the NIT to any computers that accessed the sites. The judge also allowed the FBI to delay notification to the targets for 30 days."
The FBI modified the .onion sites to serve a malicious script which was used to de-anonymize users. It's worth noting that only those using Tor improperly would be vulnerable. The FBI tracking payload required scripting to be enabled in the browser--a common blunder among inexperienced Tor users.
(Score: 3, Insightful) by PinkyGigglebrain on Thursday August 07 2014, @12:18AM
From the summary it sounds like they busted some buyers and distributors.
So this is not good; not a single child was actually saved/rescued/protected/whatever they are calling actions that actually benefit the victims now.
Just another example of LEOs going after the low hanging fruit rather than the scum that actually hurt children. Yeah, some of those arrested might also be abusers, most probably are not.
"Beware those who would deny you Knowledge, For in their hearts they dream themselves your Master."