Catalans Dragons have been fined £27,500 and Warrington Wolves £15,000 after the crowd trouble that marred their game in Perpignan back in August.
The match was winding down when trouble on the pitch, went into the stands as Warrington fans were fighting with Catalans fans in the box above.
Catalans were given the bigger fine as the RFL explained, because they, as the home team, were responsible for the planning and stewardship. The governing body deemed this on the day to be inadequate.
The French side have also had an extra £1,000 added on after an earlier suspension in 2018 against St Helens and must pay two-thirds of the investigation costs. £10,000 of their fine is also suspended until 2021.
Warrington will pay the other third and will also have £5,000 suspended until 2021.
Karen Moorhouse, RFL Chief Regulatory Officer, said: “The behaviour of some of the supporters at this fixture was completely unacceptable and has no place in Rugby League – importantly, both Catalans Dragons and Warrington Wolves have accepted that, and committed themselves to taking positive steps in response.
“All clubs have a responsibility to ensure that everybody who comes into a stadium can enjoy the game – that is a key part of our Enjoy the Game campaign, which promotes a welcoming and enjoyable experience for everyone at Rugby League, wherever it is played and whatever their role.
“This incident was highly unusual, in a game which has always taken pride in the behaviour of the vast majority of Rugby League supporters, and the family traditions it has encouraged; however, we are aware that it was not the only disappointing off-field incident in the 2019 season, and it is important we are not complacent in that regard. We will be working with clubs to reinforce the importance of the Enjoy the Game campaign during the off-season.”