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You may not know this, but refs are prohibited from using their mobile phones after they have entered the ground, contacting players and managers “outside of the match-day environment”, without permission, and asking for gifts (including player shirts), except by agreement on retirement. The regulations state that there is “no excuse for not knowing the protocol”. There is particular anger among other referees that Halsey claims to have called Ferguson asking him to stick up for Mark Clattenburg, who was being accused of racially insulting Chelsea’s John Obi Mikel (Clattenburg was cleared). For Halsey to unilaterally interject in that way, they feel, was improper. Ferguson, meanwhile, had intended to address the Clattenburg story in his Friday press conference anyway, since his team had been Chelsea’s opponents in the game in question, and needed no outside prod.