Cooper v. Pate, 378 U.S. 546 (1964), was a U.S. Supreme Court case in which the court ruled for the first time that state prison inmates have the standing to sue in federal court to address their grievances under the Civil Rights Act of 1871. This case followed Jones v. Cunningham (1963) allowing prison inmates to employ a writ of habeas corpus to challenge the legality of their sentencing and the conditions of their imprisonment.