Whether a complaint seeking damages directly for alleged violations of the Fourth and Fifth Amendments arises under the Constitution for purposes of federal-question jurisdiction, even if the same facts might also support a state-law trespass claim.
Holding
Yes. The complaint arose under the Constitution because it expressly sought recovery on the ground that federal officers violated the petitioners' Fourth and Fifth Amendment rights.
Reasoning
Federal-question jurisdiction turns first on the claim the plaintiff actually pleads. A plaintiff is ordinarily master of the complaint and may choose to rely directly on federal law. Here, the complaint did not merely describe a state-law trespass; it expressly alleged a conspiracy by federal agents to commit conduct forbidden by the Fourth and Fifth Amendments and sought damages for those constitutional violations.
The possibility that the facts might also support a state-law tort claim did not eliminate federal jurisdiction. The constitutional claims were not incidental or artificially appended to a state-law controversy. They supplied the asserted basis for recovery, so the suit presented a controversy arising under the Constitution.