§ 21-5g-6

This article does not apply:(1) To any employee or employer covered by the federal Railway Labor Act, 45 U. S. C. §151, et seq.;(2) To any employee of the United States or a wholly owned corporation of the United States;(3) To any employee who is employed on property over which the United States government has exclusive jurisdiction for purposes of labor relations; or(4) Where the provisions of this article would otherwise conflict with, or be preempted by, federal law.