Federal agents arrested four men Tuesday for trying to buy explosives and planning to manufacture ricin -- a deadly biological toxin.
Court documents state that 73-year-old Frederick Thomas told others he intended to model their actions on the online novel "Absolved," which involves small groups of citizens attacking U.S. officials.
The four listed in the indictment are Thomas; Dan Roberts, 67; Ray Adams, 65; and Samuel Crump, 68. The men live in the north Georgia towns of Cleveland and Toccoa.
An FBI spokesman said the men are members of a north Georgia militia group.
They had been talking about "covert" operations since at least March, according to court records, discussing murder, theft and using toxic agents and assassinations to undermine the state and federal government.
Two of them have been charged with purchasing a silencer and what they thought were explosives.
The other two are accused of taking steps to produce ricin and mapping out a plan to spread the chemical in the Atlanta area.
"Many of us are really focused on international violent extremists, but I think that this case really points out that we have to be vigilant and we have to stay on top of those who are within our borders here who are attempting to do harm to their own government and their own citizens," said U.S. Attorney Sally Quillian Yates.
All four of the suspects are expected to appear in court Wednesday.