Cite as: 527 U. S. 815 (1999)
23(b)(1)(B) (read with subdivision (c)(2)) provides for certification of a class whose members have no right to withdraw, when "the prosecution of separate actions . . . would create a risk" of "adjudications with respect to individual [class] members . . . which would as a practical matter be dispositive of the interests of the other members not parties to the adjudications or substantially impair or impede their ability to protect their interests." Among the traditional varieties of representative suits encompassed by Rule 23(b)(1)(B) is the limited fund class action. In such a case, equity required absent parties to be represented, joinder being impractical, where individual claims to be satisfied from the one asset would, as a practical matter, prejudice the rights of absent claimants against a fund inadequate to pay them all. Pp. 832-837.
(b) The cases forming the limited fund class action's pedigree as understood by Rule 23's drafters have a number of common characteristics, despite the variety of circumstances from which they arose. These characteristics show what the Advisory Committee must have assumed would be at least a sufficient set of conditions to justify binding absent members of a Rule 23(b)(1)(B) class, from which no one has the right to secede. In sum, mandatory class treatment through representative actions on a limited fund theory was justified with reference to a "fund" with a definitely ascertained limit that was inadequate to pay all claims against it, all of which was distributed to satisfy all those with claims based on a common theory of liability, by an equitable, pro rata distribution. Pp. 838-841.
(c) There are good reasons to treat the foregoing characteristics as presumptively necessary, and not merely sufficient, to satisfy the limited fund rationale for a mandatory class action. At the least, the burden of justification rests on the proponent of any departure from the traditional norm. Although Rule 23(b)(1)(B)'s text is open to a more lenient limited fund concept, the greater the leniency in departing from the historical model, the greater the likelihood of abuse in ways that are apparent when the limited fund criteria are applied to this case. The prudent course, therefore, is to presume that when subdivision (b)(1)(B) was devised to cover limited fund actions, the object was to stay close to the historical model. This limiting construction finds support in the Advisory Committee's expressions of understanding, which clearly did not contemplate that the mandatory class action codified in subdivision (b)(1)(B) would be used to aggregate unliquidated tort claims on a limited fund rationale. The construction also minimizes potential conflict with the Rules Enabling Act, which requires that rules of procedure "not abridge, enlarge or modify any substantive right," 28 U. S. C. § 2072(b). See, e. g., Amchem, supra, at 613. Finally, the Court's construction avoids serious constitutional concerns, including the Seventh
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