Build huge prison tent camps in the desert and put everyone in those organizations there until interrogations reveal who the top leaders were who organized all of this.
Better still, build a prison like Russia’s Black Dolphin prison. Locate it in the most frigid, remote place we own, and staff it with wardens and guards with instructions to run the place with the same level of strictness.
Classify it one level above Supermax, and this is where domestic terrorists and all those who fund or aid them go. Once there, they no longer have a name: Only a number. And once you go in very seldom does one get out.