SDCL § 60-9A-5: Jurisdiction of department over labor disputes and grievances.

The department shall have jurisdiction over any labor dispute or grievance not subject to the provisions of the Federal Railway Labor Act, and over which the national labor relations board does not have or has declined to assert jurisdiction on substantive grounds. For purposes of determining whether or not the National Labor Relations Board has asserted jurisdiction on substantive grounds, the department shall respect the relevant rules and regulations and case ruling of the board.