Whether Article III permits Bond to challenge her federal conviction on the ground that Congress exceeded its constitutional powers.
Holding
Yes. Bond's incarceration supplied a concrete, particularized injury caused by her conviction and redressable by invalidating it, so Article III posed no obstacle.
Reasoning
Article III standing was straightforward in this criminal case. Bond was convicted and imprisoned under the challenged federal statute. A ruling that the statute was unconstitutional as applied to her could invalidate her conviction and relieve that injury, creating the concrete adverseness required for a federal case or controversy.
The Court also distinguished a defendant's ability to raise a defense from the question whether a plaintiff may initiate a suit. Once the Government prosecuted Bond and sought to sustain her conviction and sentence, Article III did not limit her ability to object to the legal basis for the relief sought against her.