Harden have been hit with a suspended $2000 fine and will have to undergo cultural awareness training for failing to adequately deal with spectators who racially abused Indigenous players at one of their Katrina Fanning Shield home games this season.
It's unclear whether Harden will appeal the Canberra Region Rugby League's decision given they didn't return The Canberra Times' calls on Friday.
An independent disciplinary hearing upheld the CRRL's proposed sanctions in a marathon session on Wednesday night.
Harden faces the fine as part of a two-year good-behaviour bond that runs until the end of 2023, while they also have to complete their cultural awareness training before the start of next season.
They also have to review their game-day ground-management procedures, while increasing warning signage about penalties for inappropriate behaviour at their home ground - as well as making regular announcements about proper behaviour.
The abuse occurred at a Harden WorHawks home game against the Boomanulla Raiders on July 31.
A group of male spectators yelled racist abuse, including "dirty black dogs", and while the Harden ground manager asked them to be quiet they weren't asked to leave.
Boomanulla filed a complaint with the CRRL.
"Under the NRL code of conduct clubs have to take responsibility for their spectators on their match days," CRRL general manager Mark Vergano said.
"It was a long process at the hearing and this would be a message that the CRRL stands by the NRL code of conduct.
"We don't support any racial vilification or discrimination, and we ask spectators especially to think carefully and act in an appropriate manner when they go to matches."
Vergano said he was happy with how the process played out.
"It went through an independent process and so we're happy that the process was robust, and both clubs were able to present their case to an independent panel," he said.
"We put our trust in the codes of conduct and the Tough Love in League policy, and we trust in the skill and judgement of our independent tribunals.
"That's really important to give confidence to the system, but also the people who present their [case] on both sides."
We don't support any racial vilification or discrimination and we ask spectators ... [to] act in an appropriate manner.Mark Vergano