Rules on Civil Procedure
Section 8. Service upon entity without juridical personality. - When persons associated in an entity without juridical personality are sued under the name by which they are generally or commonly known, service may be effected upon all the defendants by serving upon any one of them, or upon the person in charge of the office or place of business maintained in such name. But such service shall not bind individually any person whose connection with the entity has, upon due notice, been severed before the action was brought. (9a)