S.C. Code § 23-15-70
Any sheriff, deputy sheriff, constable or other officer specially empowered may call out the bystanders or posse comitatus of the proper county to his assistance whenever he is resisted or has reasonable grounds to suspect and believe that such assistance will be necessary in the service or execution of process in any criminal case and any deputy sheriff may call out such posse comitatus to assist in enforcing the laws and in arresting violators or suspected violators thereof. Any person refusing to assist as one of the posse comitatus in the service or execution of such process, when required by the sheriff, deputy sheriff, constable or other officer shall be liable to be indicted therefor and upon conviction shall be fined and imprisoned, at the discretion of the court any person who shall fail to respond and render assistance when summoned by a deputy sheriff to assist in enforcing the laws and in arresting violators or suspected violators thereof shall be guilty of a misdemeanor and, upon conviction shall be fined not less than thirty nor more than one hundred dollars or imprisoned for thirty days.
S.C. Code § 23-15-70