The Bureau of Labor Statistics, under the direction of the Secretary of Labor, shall collect, collate, and report at least once each year, or oftener if necessary, full and complete statistics of the conditions of labor and the products and distribution of the products of the same, and to this end said Secretary shall have power to employ any or either of the bureaus provided for his department and to rearrange such statistical work, and to distribute or consolidate the same as may be deemed desirable