(CNN) -- Two Georgia men will spend five years in prison for their roles in a plot to kill government officials, the U.S. attorney's office said Wednesday.
Frederick Thomas, 73, and Dan Roberts, 68, pleaded guilty in April to conspiring to obtain an unregistered explosive device and silencer.
A statement from U.S. Attorney Sally Quillian Yates said Thomas and Roberts were members of a known militia organization and were attempting to recruit others to join "the covert group."
Undercover agents met with Thomas in 2011 and recorded conversations in which he stated that he had compiled a "bucket list" of government employees, politicians, corporate leaders and members of the media who needed to be "taken out."
"These defendants didn't just talk about killing government officials and law enforcement officers, they purchased equipment," Yates said.
After four meetings, Thomas and Roberts were arrested November 1 when they gave the undercover agents money and a firearm in exchange for a silencer for an M-4 assault rifle and what they believed were C-4 explosives, officials said.
The men told agents they had specific targets in mind, and Roberts said he considered himself to be "expendable" at his age and was "prepared to die if necessary," according to the statement.
Arrests were made by the FBI's Joint Terrorism Task Force in Atlanta.
The men's prison sentences will be followed by three years of supervised release.
"The FBI's number one priority is to prevent another terrorist attack," Special Agent in Charge Brian Lamkin said.