N.J. Stat. § 34:9-2
In the construction of any public work for the state, or any county, city, town, township, or borough, or other municipal corporation or any board, committee, commission or officer thereof, whether the same be a building, excavation, sewer, or drainage construction, road building, paving, bridge, or any other form or kind of public work, preference in employment thereon shall be given to citizens of the state of New Jersey who have resided and maintained domiciles within the state for a period of not less than one year immediately prior to such employment. Persons other than citizens of the state may be employed when such citizens are not available.
Every contract for the construction of public works shall provide that if this section is not complied with the contract shall be voidable at the instance of the state, county or municipality.
All boards, officers, agents or employees having the power to enter into contracts which provide for the expenditure of public money on public works, shall file in the office of the commissioner of labor the names and addresses of all contractors holding contracts with the state, or any county, or municipal corporation, or with any board, committee, commission or officer thereof. Upon the demand of the commissioner a contractor shall furnish a list of the names and addresses of all his or its subcontractors.
Each contractor performing work for the state, or for any county, or municipal corporation, or for any board, committee, commission, or officer thereof shall keep a list of his or its employees, stating whether they are native born citizens or naturalized citizens, and in case of naturalization, the date thereof and the name of the court in which granted.
Any person, firm, or corporation violating the provisions of this section shall be deemed and adjudged a disorderly person, and upon conviction shall be punishable by a fine of not less than fifty dollars nor more than five hundred dollars, or by imprisonment of not less than thirty days nor more than ninety days, or by both such fine and imprisonment.
N.J.S. § 34:9-2