S.C. Code Ann. § 7-13-140

Managers of election are clothed with such police powers as may be necessary to carry out the provisions of this article. The managers shall possess full authority to maintain good order at the polls and to enforce obedience to their lawful commands during an election and during the canvass and counting of the votes. All peace officers shall answer all such calls for help in preserving the peace as may be made by the managers of election.