In the event that the state shall accept any provision of any such act of congress which authorizes and grants aid in the construction of school facilities, the superintendent of public instruction [secretary] shall, by contract or otherwise, enforce labor standards not less beneficial to employees on such projects than those required under Sections 1 and 2 of the act of August 30, 1935 (49 Stat. 1011, ch. 825), as amended; provided, that the act of congress authorizing such aid shall so require.