This educational guide is based on the linked primary sources. It is not a Court publication, is not affiliated with the Court, and is not legal advice.
In brief
Overview
According to Scott L. Nelson (Petitioner), according to Scott L. Nelson (Petitioner), the petitioner argues that the Rules Enabling Act governs both diversity and federal question cases.
According to Scott L. Nelson (Petitioner), according to Scott L. Nelson (Petitioner), the petitioner contends that the rule at issue is a policy rather than a substantive rule, citing the New York Court of Appeals' view that class actions were not necessary in this category.
According to Mr. Nelson, the petitioner points to the “unless” clause in 901(b) and argues that New York courts have applied it to both state and federal statutes, allowing class actions under the Truth in Lending Act but not under the Telephone Consumer Protection Act.
According to Christopher Landau, the petitioner raises concerns that allowing recovery of state law penalties in federal court could distort forum choices, invoking the Erie doctrine.
The petitioner warns that class actions could lead to overenforcement.
Background and question before the Court
Justice Ginsburg asked whether the procedural standard has a substantive purpose of restricting penalty recoveries.
According to Justice Scalia, justice Scalia inquired whether the rule had been applied.
According to Justice Stevens, justice Stevens requested a brief hypothetical.
Justice Stevens suggested framing the claim under the insurance code rather than against insurance companies.
Justice Ginsburg asked how the issue differs from security for costs.
According to Chief Justice Roberts, chief Justice Roberts questioned whether New Mexico could prohibit out‑of‑state class actions.
- [1] 093b926cfa0956ef35f5-r1-2268f733e3d0b106.pdf, p. 5
- [2] 093b926cfa0956ef35f5-r1-2268f733e3d0b106.pdf, p. 15
- [3] 093b926cfa0956ef35f5-r1-2268f733e3d0b106.pdf, p. 20
- [4] 093b926cfa0956ef35f5-r1-2268f733e3d0b106.pdf, p. 21
- [5] 093b926cfa0956ef35f5-r1-2268f733e3d0b106.pdf, p. 22
- [6] 093b926cfa0956ef35f5-r1-2268f733e3d0b106.pdf, p. 42
What each side argues
Petitioner
According to Scott L. Nelson (Petitioner), according to Scott L. Nelson (Petitioner), the petitioner argues that the Rules Enabling Act governs both diversity and federal question cases.
According to Scott L. Nelson (Petitioner), according to Scott L. Nelson (Petitioner), the petitioner contends that the rule at issue is a policy rather than a substantive rule, citing the New York Court of Appeals' view that class actions were not necessary in this category.
According to Mr. Nelson, the petitioner points to the “unless” clause in 901(b) and argues that New York courts have applied it to both state and federal statutes, allowing class actions under the Truth in Lending Act but not under the Telephone Consumer Protection Act.
According to Christopher Landau, the petitioner raises concerns that allowing recovery of state law penalties in federal court could distort forum choices, invoking the Erie doctrine.
Respondent
Source-limited. The record does not yet support a complete account.
What happened at oral argument
Oral argument was held before the Supreme Court at 10:58 a.m.
What the Court decided
Why it matters
The case highlights how procedural rules can have substantive effects, potentially influencing the ability to recover state‑law penalties in federal court and affecting forum choices under the Erie doctrine.
Terms to know
No glossary terms are available for this guide.
Primary sources
Read the source materials on the official site or open the immutable repository copy used for this guide.
- 093b926cfa0956ef35f5-r1-2268f733e3d0b106.pdforal argument transcript
Guide generated September 23, 2026. Automated validation accepted this version.