The Bill of Attainder clause was among the topics of my Advanced Constitutional Law class last semester, so while I am not an expert on the clause, I’ll try to provide some guidance.
First, there are few Supreme Court cases on the clause. Second, Bill of Attainder controversies in the United States never involve the classic bills of attainder that were well-known to the Founders–namely a parliamentary vote that someone be executed for treason or some other crime. Accordingly, for Bill of Attainder law in the United States, the ratio of settled law to gray zones is lower than for many other topics of constitutional law. In my view, the legal analysis from the District Court (ruling for ACORN) and from the Second Circuit (ruling against ACORN) are both plausibly based in precedent. The Second Circuit examined matters of law de novo, so District Court’s legal analysis was entitled to no deference.
Here are the key points of the Second Circuit decision:
ACORN has standing to sue all the defendants. Even if ACORN has no interest in applying for Department of Defense grants, the fact that the DoD statute specifically forbids grants to ACORN causes a reputational injury to ACORN.
Whether something is a Bill of Attainder depends on a three-part test: (1) “specification of the affected persons,” (2) “punishment,” and (3) “lack of a judicial trial.”
The government conceded on items (1) and (3). Accordingly the question is whether the federal funding cut-off constitutes “punishment.” Here again there is a three-part test (verbatim from the Second Circuit):
(1) whether the challenged statute falls within the historical meaning of legislative punishment (historical test of punishment);
(2) whether the statute, “viewed in terms of the type and severity of burdens imposed, reasonably can be said to [...]