Section 10. Employment of aliens

No person not a citizen or ward of the United States shall be employed upon or in connection with any state, county or municipal works or employment; provided, that nothing herein shall be construed to prevent the working of prisoners by the state or by any county or municipality thereof on street or road work or other public work and that the provisions of this section shall not apply to the employment of any teacher, instructor, or professor authorized to teach in the United States under the teacher exchange program as provided by federal statutes enacted by the congress of the United States or the employment of university or college faculty members. The legislature shall enact laws for the enforcement and shall provide for the punishment of any violation of this section.