N.J. Stat. § 6:1-11

The chairman of the commission shall have power to administer oaths and, when directed by vote of the commission, to subpoena and require the attendance of witnesses in this state and the production of books and papers pursuant to any investigation or inquiry made or held by the commission touching any of the provisions of this chapter. Subpoenas shall be made returnable at the office of the commission at the state capitol or in any municipality in the state, and may be served by registered mail or by personal service. Any person who shall be served with such a subpoena and shall neglect or refuse to appear or testify or to produce books and papers relevant to such investigation or inquiry as commanded in the subpoena, shall, upon the facts thereof being certified in writing to the attorney general, be subject to a penalty of not exceeding one hundred dollars, to be recovered with costs in an action at law to be prosecuted by the attorney general.