A federal grand jury on Thursday indicted the leader and two members of a Fairbanks militia on additional weapons counts.
Francis Schaeffer Cox, along with Coleman Barney and Lonnie Vernon, already faced six counts. The grand jury indictment added four more.
They now face charges including conspiracy to possess or possession of unregistered silencers, destructive devices, and a machine gun; making a silencer, and carrying a firearm during a crime of violence.
The group was accused in state court of making a plan to kill Alaska State Troopers and court officials. But those charges were dropped because of illegally obtained evidence.
Authorities have said Cox was an advocate of the "241" retaliation plan -- killing or kidnapping two officials for every member of his group who was killed or arrested.