Section 4
SEC. 4. No person, firm, or corporation, business establishment or place or center of labor shall compel an employee or laborer to work during Sundays and legal holidays, unless he is paid an additional sum of at least twenty-five per centum of his regular remuneration: Provided however, That this prohibition shall not apply to public utilities performing some public service such as supplying gas, electricity, power, water, or providing means of transportation or communication.