Section 5. Writers. The term "Writers" as used herein shall mean the persons who are employed by Producers to render writing services in the broadcasting and motion picture industries within the jurisdiction of WGA and who are covered by the terms of any of the collective bargaining agreements described in Section 2 of this Article. The term "Writers" shall also include a person who is employed by WGA, by the Health Fund Office, by the Producer-Writers Guild of America Pension Plan Office, or by the Interguild Federal Credit Union.