N.Y. General Associations Law § 13: Action or proceeding against unincorporated association

§ 13. Action or proceeding against unincorporated association. An

action or special proceeding may be maintained, against the president or

treasurer of such an association, to recover any property, or upon any

cause of action, for or upon which the plaintiff may maintain such an

action or special proceeding, against all the associates, by reason of

their interest or ownership, or claim of ownership therein, either

jointly or in common, or their liability therefor, either jointly or

severally. Any partnership, or other company of persons, which has a

president or treasurer, is deemed an association within the meaning of

this section.

The service of summons, subpoena or other legal process of any court

upon the president, vice president, treasurer, assistant treasurer,

secretary, assistant secretary, or business agent, in his capacity as

such, shall constitute service upon a labor organization. Such service

shall be made on such individuals in the manner provided by law for the

service of a summons on a natural person.