Terry was sent off for fouling Manchester City striker Jo, on Saturday, but the dismissal was overturned by the FA.
Fergie blasted: “I understand Hackett told ref Mark Halsey to rescind the card and he wouldn’t. So now he Is refereeing in League Two this weekend.
“I do not understand how this has happened. If it had been a Manchester United player, Hackett would not have done this.
“This is going to have to happen all the time if a referee is considered to have made a mistake.”
