2015 New York Laws
GAS - General Associations
Article 3 - (General Associations) ACTION OR PROCEEDING BY OR AGAINST UNINCORPORATED ASSOCIATIONS
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.