content: I'd imagine there's a reasonable chance that we're actually looking at things play out in the opposite direction: parallel construction. That people were organizing on that site in order to break the law is hardly a secret. I would be extremely surprised if it was not under surveillance if for no other reason than to ensure that their planned lawlessness didn't go beyond petty rioting. The site was also likely filled with law enforcement plants. The latter part in particular could also explain why the warrant was broad and the affidavit behind it sealed. Revealing exactly what they know (as in exactly what names they're after) could reveal undercover agents and other knowledge that law enforcement would rather keep confidential for current and future investigations.