S.C. Code Ann. § 59-67-245

No person shall wilfully and wrongfully interfere with the operation of a school bus, either public or private, by boarding, restricting movement or using threats, either physical or verbal, to the driver or any passenger while the bus is engaged in the transportation of pupils to and from school or any lawful school activity or while passengers are entering or leaving the bus nor shall any person wilfully fail or refuse to obey a lawful order of a school bus driver relating to the occupancy of a school bus. The use of threatening, obscene or profane language addressed to the driver or any passenger entering, leaving or waiting for a school bus is disorderly conduct and any person convicted for the use of such language shall be punished as provided in Section 16-17-530. Nothing contained herein shall be interpreted to infringe upon the power and duties of duly constituted authorities.