BROWN v. PLATA (09–1233) Argued November 30, 2010—Decided May 23, 2011:
JUSTICE KENNEDY delivered the opinion of the Court.
"This case arises from serious constitutional violations in California’s prison system. The violations have persisted for years. They remain uncorrected. The appeal comes to this Court from a three-judge District Court order direct-ing California to remedy two ongoing violations of the Cruel and Unusual Punishments Clause, a guaranteebinding on the States by the Due Process Clause of theFourteenth Amendment. The violations are the subject oftwo class actions in two Federal District Courts. The first involves the class of prisoners with serious mental disor-ders. That case is Coleman v. Brown. The second involves prisoners with serious medical conditions. That case is Plata v. Brown. The order of the three-judge District Court is applicable to both cases....
This Court now holds that the PLRA does authorize the relief afforded in this case and that the court-mandated population limit is necessary to remedy the violation ofprisoners’ constitutional rights. The order of the three-judge court, subject to the right of the State to seek its modification in appropriate circumstances, must be affirmed...."