S.C. Code Ann. § 11-25-680
The officials charged with the distribution shall annually forward by mail or otherwise, as they may deem expedient, the following number of such publications to the Library of Congress, Washington, D. C., to wit:
(3) Eight copies of the Acts and Joint Resolutions.
These provisions are made in recognition of benefits received through receipt at depository libraries and elsewhere in the State of public documents of the United States under the provisions of Federal laws.