Wash. Sup. Ct. Civ. R. 23.2
As amended throough October 10, 2024
An action brought by or against the members of an unincorporated association as a class by naming certain members as representative parties may be maintained only if it appears that the representative parties will fairly and adequately protect the interests of the association and its members. In the conduct of the action the court may make appropriate orders corresponding with those described in rule 23(d), and the procedure for dismissal or compromise of the action shall correspond with that provided in rule 23(e).
Wash. Sup. Ct. Civ. R. CR 23.2