Section 92. Supervisors of attendance may visit the factories, workshops, manufacturing, mechanical and mercantile establishments, theatres, and places of public exhibition in their several towns, and ascertain whether any children are employed therein contrary to this chapter, and shall report in writing any cases of such illegal employment to the superintendent of schools or the school committee and to the department or its authorized officers or agents. Inspectors shall visit all factories, workshops, manufacturing, mechanical and mercantile establishments within their respective districts, and ascertain whether any children are employed therein contrary to this chapter, and shall enter complaint against whomever is found to have violated any of its provisions. No inspector shall knowingly or wilfully violate any provision of this section.