358 security police officers sued G4S Government Solutions, Inc., formerly known as Wackenhut. They say the company violated the Fair Labor Standards Act by requiring them to work before and after their shifts without paying them for their time.
The tasks included gathering and returning required equipment and travel to and from appointed posts.
A federal judge approved a settlement in the case this month worth more than $2.6 million.
The plaintiffs say they're satisfied with the decision.
"We've not asked for anything we weren't owed. We've just asked for them to comply with the law and to pay us appropriately and they've agreed to do that," said Shannon Gray, president of the International Guards Union of America, Local 3.
Under the settlement, G4S will pay each guard for an average of 15 minutes before each shift.
Those whose posts were farthest away received an average of seven additional minutes for work time after their shift ended. The settlement also covers attorney fees and expenses.
G4S lost its contracts in Oak Ridge back in 2012 and 2013.