Wales and France have been handed fines of �50,000 each suspended for two years after a brawl at the end of Saturday's Junior World Championships match.
They will also start the next two World Championships on minus-three points after being found guilty of misconduct.
The fracas started after Wales clinched a late win over the French to reach the semi-finals.
Djibril Camara, Jeremy Braille, Rabah Slimani of France and Wales' Jevon Groves have all received suspensions.
None of them will play any further part in the tournament, and Groves' three-week ban starts immediately.
Camara and Braille received nine-week suspensions each, while Slimani will be out for 13 weeks, but those bans will not start until 9 August.
The trio had already been sent home by French team manager Philippe Sella.
The rulings come following an IRB Junior World Championship 2008 judicial hearing into the brawl at Swansea's Liberty Stadium.
An IRB statement said: "Both teams accepted that the behaviour of their teams following Wales' victory at the was not acceptable and acknowledged collective responsibility for bringing the Championship into disrepute.
"The judicial officer found that both teams displayed behaviour or practices that brought the game of rugby union, the IRB and the IRB Junior World Championship into disrepute as a result of a "serious act" of violence involving players and other personnel from both teams".
If either union is found guilty of a misconduct charge at any level in the next two years, they will have to pay the �50,000 fine.
The parties have 48 hours to appeal the decision.
A statement from the Welsh Rugby Union said: "The WRU is considering the implications of the result.
"The focus of this review of the findings concerns the imposition of a sanction deducting three points from Wales age grade rugby teams taking place in IRB tournaments during 2009 and 2010.
"The WRU condemns violence and misconduct and accepts without question the other sanctions imposed at the hearing which took place in Cardiff this week.
"Legal and rugby advisers are being asked by the WRU for their views on the points deduction sanction which inevitably penalises young players yet to be selected for future squads.
"Welsh rugby officials will also liaise with their counterparts from the French Rugby Federation to consider the implications of the sanctions."
Wales won the match 23-19 after coming back from 19-9 down with three minutes remaining.
Leigh Halfpenny's try deep into overtime sealed an unlikely win, which was rapidly followed by ugly post-match scenes.
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