New York Consolidated Laws, General Associations Law - GAS § 12. Action or proceeding by unincorporated association

An action or special proceeding may be maintained, by the president or treasurer of an unincorporated association to recover any property, or upon any cause of action, for or upon which all the associates may maintain such an action or special proceeding, by reason of their interest or ownership therein, either jointly or in common. An action may likewise be maintained by such president or treasurer to recover from one or more members of such association his or their proportionate share of any moneys lawfully expended by such association for the benefit of such associates, or to enforce any lawful claim of such association against such member or members.