William Krar, 62, with ties to white supremacist groups, pleaded guilty to possessing a chemical weapon and faces life in prison, while 54-year-old Judith Bruey could get five years. She pleaded guilty to conspiracy to possess illegal weapons.
"They certainly had the capacity to be extremely dangerous," says U.S. assistant attorney Wes Rivers.
What agents found at a storage facility shocked them.
Photographs obtained by Dallas CBS station KTVT show illegal machine guns, boxes filled with 500,000 rounds of ammunition, homemade bombs, bomb-making instructions, antidotes for nerve agents and a Ku Klux Klan calling card.
All of it discovered after fake documents Krar mailed to an alleged New Jersey militia member were actually delivered to a New York address.
Teresa Staples, the storage owner, asks: "Why did they pick such a small storage facility? Why did they pick this town?"
Mysterious, too, are seized papers indicating plans for a covert operation.
One document titled "procedure" lists code words for meeting places in nine cities to be referred to as "zones." Other notes give code words and instructions on how to throw law enforcement off their trail.
In the wake of Sept. 11, there is concern that homegrown terrorists may be operating under the federal radar.
"It's scary when you look at the capabilities, look at the vulnerabilities of our society," says former FBI agent Danny Coulson. "We don't have to concern ourselves so much with only foreign terrorists, but we need to concern ourselves with domestic terrorists too, and these guys are dangerous."
Also unsettling is the fact that Krar and the others have refused to cooperate with authorities. If they did have a target for terror planned, they will likely take it to prison when they're sentenced next month.