S.C. Code Ann. § 22-5-140: Arrests by magistrates to preserve the peace.

Any magistrate shall command all persons who, in his view, may be engaged in riotous or disorderly conduct to the disturbance of the peace, to desist therefrom and shall arrest any such person who shall refuse obedience to his command and commit to jail any such person who shall fail to enter into sufficient recognizance either to keep the peace or to answer to an indictment, as the magistrate may determine.