David Kravitz (Blue Mass Group) — a very smart appellate lawyer and a former law clerk for Justice Sandra Day O’Connor — writes on the subject. The most recent case I know of involving bills of attainder in the business law context is Consolidated Edison Co. v. Pataki, 292 F.3d 338 (2d Cir. 2002), which struck down as a bill of attainder the following New York statute: