185. Voluntary intervention is termed aggressive when the third person seeks to be acknowledged as having, against the parties or one of them, a right which is in dispute. It is termed conservatory when the third person wishes to be substituted for one of the parties in order to represent it, or to be joined with one of the parties in order to assist it or support its claims. A third person is said to intervene as a friend of the court when seeking only to participate in argument during the trial.
A third person who intervenes for aggressive or conservatory purposes becomes a party to the proceeding.