While most of the sovereign debt world is focused on Mr. Maduro’s shenanigans in Venezuela, a fascinating litigation is playing out in federal district court in Puerto Rico. Aurelius, a hedge fund known to many of us because of the role it played in the legendary pari passu litigation against Argentina, is challenging the constitutionality of the Control Board that was put in place to run Puerto Rico’s debt restructuring (and, essentially, key aspects of its fiscal affairs).