N.J. Stat. § 4:15-3: Police jurisdiction of directors

For the purpose of maintaining order and preserving the peace and decorum upon grounds on which a fair and exhibition is held by an association the directors shall:

a. Have police jurisdiction upon the grounds and for a distance of one-quarter of a mile from the boundaries of the grounds;

b. Suppress the sale of intoxicating liquors by persons not regularly licensed by the public authorities; and

c. Prohibit every species of gambling and breach of the peace or laws of this state.