Section 704-A. Unfair practices; performing arts

It shall not be an unfair
  labor practice for an employer engaged in the performing arts to make an
  agreement with a labor organization, of  which  performing  artists  are
  members, covering employees engaged in the performing arts, or who, upon
  their  employment,  will  be  so engaged, because the majority status of
  such labor organization has not been established under the provisions of
  this article or because such  agreement  requires,  as  a  condition  of
  employment,  membership in such labor organization after the seventh day
  following the beginning of such employment or the effective date of such
  agreement,  whichever  is  later.  Nothing  in  this  section  shall  be
  construed  as  to  bar  any proceeding brought pursuant to section seven
  hundred five of this article.