S.C. Code Ann. § 39-73-70: Agency, vicarious, and joint and several liability.

(A) The act, omission or failure of an official, an agent, or another person acting for an individual, an association, a partnership, a corporation, or a trust within the scope of his employment or office is deemed the act, omission or failure of the individual, association, partnership, corporation, or trust as well as of the official, agent, or other person.

(B) Every person who directly or indirectly controls another person liable under this chapter, every partner, officer, or director of the other person, every person occupying a similar status or performing similar functions, every employee of the other person who materially aids in the violation also is liable jointly and severally with and to the same extent as the other person, unless the person who also is liable by virtue of this section sustains the burden of proof that he did not know and in exercise or reasonable care could not have known of the existence of the facts by reason of which the liability is alleged to exist.