This is a set phrase ' to call to order' means to declare that the official proceedings of a court or other formal gathering are now underway and everyone present has to assume their correct position and adhere to the rules of the event. The same expression is often used in relation to meetings - the chairman called the meeting to order - this might happen at the beginning, or, if it occurs during the course of the meeting it suggests that the participants have begun behaving badly, arguing and getting off the point, or being disruptive and generally upsetting the good order of the proceedings.