Holding: When an arbitrator determines that the parties to an arbitration intended to authorize class-wide arbitration, that determination survives judicial review under § 10(a)(4) of the Federal Arbitration Act as long as the arbitrator was arguably construing the contract.
Judgment: Affirmed, 9-0, in an opinion by Justice Kagan on June 10, 2013. Justice Alito filed a concurring opinion in which Justice Thomas joined.
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