Featherstone have been fined £10,000 following crowd trouble at their game against Bradford on 26 May.
Half of the sum is suspended until the end of the 2020 season.
In a statement the RFL said it “took into account mitigation from the club in making the decision, and has welcomed Featherstone’s proactive approach to the issue in recent weeks”.
The statement adds: “As the governing body, the RFL continues to work with all sections of the game on the Enjoy the Game campaign and is committed to ensuring that Rugby League is an inclusive sport accessible to and enjoyed by all.”
Featherstone banned three supporters earlier this season.