Necessary parties in equity

One of the great principles upon which courts of equity generally require all parties who are known, and within the reach of its jurisdiction, to be made parties, is to prevent future litigation, and to take away multiplicity of suits. It is a matter of justice, as well as of convenience, that all the parties who are ultimately liable to contribution, should, when practicable, be brought before the court, so that the equities between them may be adjusted, as well as the right of the plaintiff. There are exceptions it is true, to the rule, but they are founded upon special considerations.