N.Y. Lab. Law § 704-a

§ 704-a. Unfair practices; performing arts. It shall not be an unfair\nlabor practice for an employer engaged in the performing arts to make an\nagreement with a labor organization, of which performing artists are\nmembers, covering employees engaged in the performing arts, or who, upon\ntheir employment, will be so engaged, because the majority status of\nsuch labor organization has not been established under the provisions of\nthis article or because such agreement requires, as a condition of\nemployment, membership in such labor organization after the seventh day\nfollowing the beginning of such employment or the effective date of such\nagreement, whichever is later. Nothing in this section shall be\nconstrued as to bar any proceeding brought pursuant to section seven\nhundred five of this article.\n