Article 5, Section 3. 
          Other Collective Bargaining Agreements
          In   addition to the Producers which are parties to the Writers' Guild-   Industry Health Fund Trust Agreement, any employer who enters   into or becomes bound by a WGA collective bargaining agreement,   to which this Trust Agreement is annexed with the approval of   the Trustees, may become a party to this Trust Agreement and contribute   to the Health Fund pursuant to the terms hereof, upon the   vote of three-fourths of the Trustees present and voting at a   meeting of the Trustees at which a quorum is present. Any Trustee   may require a unit vote in accordance with the provisions of   Section 5 of Article VI.