1 For purposes of the exemption discussed in § 2580.412-2, the term “union” shall include “* * * any organization of any kind or any agency or employee representation committee, association, group, or plan, in which employees participate and which exists for the purpose in whole or in part, of dealing with employers concerning an employee welfare or pension benefit plan, or other matters incidental to employment relationships * * *” (29 U.S.C. 302(a)(3)).