Shareholder activist Stephen Mayne has launched a bid to join the Brisbane Broncos board, with one aim in mind – the removal of News Corp as the club’s majority shareholder. Mayne said the US-based media company’s 24-year grip on the club represented an unacceptable conflict of interest and was out of step with Australian sporting traditions. Speaking ahead of the Broncos’ upcoming annual general meeting, at which he will self-nominate for the board, Mayne said News Corp’s near-70 per cent holding in the club was an “anomaly” that would not be tolerated elsewhere in Australian sport. Shareholder activist Stephen Mayne is seeking a seat on the Brisbane Broncos board - and wants Rupert Murdoch’s News Corp out of the club. Jamie Brown “The biggest newspaper in Queensland owns and controls the biggest sporting team in Queensland,” he told this masthead.…