Whether Federal Rule of Civil Procedure 23 conflicts with New York CPLR § 901(b), which forbids class actions seeking statutory penalties or minimum statutory recoveries unless the underlying statute authorizes them.
Holding
Yes. Rule 23 and § 901(b) answer the same question—whether Shady Grove may maintain this suit as a class action—and therefore conflict.
Reasoning
The Court applied the Hanna framework. It first asked whether Rule 23 answers the disputed question. If the Rule controls that question, it displaces contrary state law unless the Rule exceeds Congress's authority under the Rules Enabling Act or the Constitution. Erie analysis matters only when no applicable and valid Federal Rule governs.
Rule 23 states that a class action may be maintained when the prerequisites in Rule 23(a) and one of Rule 23(b)'s categories are satisfied. The Court read this as a categorical authorization for a plaintiff meeting those requirements to proceed as a class, not as permission for states to impose additional claim-specific bars.
Section 901(b) likewise decides whether an action may be maintained as a class action, but it gives the opposite answer when the suit seeks a statutory penalty or minimum recovery. The Second Circuit's distinction between a claim's eligibility for class treatment and its certifiability was artificial: both are conditions on maintaining a class action, and Rule 23 does not leave a separate eligibility question for state law to resolve.
The Court rejected the argument that § 901(b) merely limits remedies rather than class procedure. By its text, the provision prevents the covered class action from being maintained at all; it does not simply cap damages or withdraw a remedy after a class has properly been certified. A plaintiff's ability to omit a penalty claim and bring a different class action does not transform the statutory class-action prohibition into a remedial limit.
The Court also declined to let the asserted substantive purpose behind § 901(b)—avoiding excessive aggregate liability—eliminate the textual conflict. Making conflict turn on legislative purpose would require federal courts to investigate and characterize the purposes behind state procedural provisions, could cause identical state laws to receive different treatment, and would create substantial uncertainty.