Michael Hernandez de Luna earned a spot on a government watchlist when federal authorities launched an investigation into his work “Fruit Flavored Anthrax.” His crime? Creating fake stamps to artfully critique the institutions that govern contemporary society by testing the limits of the United States Postal Service in the process. For years the artist has been successfully sending letter after letter to himself from all around the world, each one marked with one or more of his counterfeit, controversial stamps. For him, it was a form of political satire. For the Secret Service, it was a federal crime deserving of serious prison time.