The notice carries a possible fine of $10,000. NRL chief executive David Gallop questioned Bennett's remarks about referees continually �pre-judging� the Broncos side. The report claims that Bennett attacked the integrity of a number of officials.
�Such accusations are serious and attack the very integrity of the game and of respected officials,� Mr Gallop said.
�Were anyone to have a genuine belief that they were the victim of bias then it is an issue that should be raised at the highest level.
�I invite any club official with that genuine view to come forward and to present a clear and concise case which I will personally see is investigated thoroughly.
�This is not an issue which can be generalised about in a media conference with no genuine testing of the claim and where there is no opportunity for those involved to defend themselves.
�The only recourse left to the officials involved were such a situation condoned would be the legal system, and that is hardly the most positive outcome for the game.�
The Broncos have been given seven days to respond to the breach notice.
The NRL has today also formally contacted the Parramatta club in relation to security breaches on Friday night which led to plastic bottles being thrown at players.
"We will receive a full report from the club and a review of their security arrangements," Gallop said.
"Other clubs have restricted sale of some products to avoid such instances and it may be that Parramatta will need to look at doing the same thing." Gallop said.