Congress recently enacted a statute imposing severe criminal penalties on anyone engaged in trading in the stock market who, in the course of that trading, takes "unfair advantage" of other investors who are also trading in the stock market. The statute does not define the term "unfair advantage." There have been no prosecutions under this new statute. The members of an association of law school professors that is dedicated to increasing the clarity of the language used in criminal statutes believe that this statute is unconstitutionally vague. Neither the association nor any of its members is currently engaged in, or intends in the future to engage in, trading in the stock market. The association and its members bring suit against the Attorney General of the United States in a federal district court, seeking an injunction against the enforcement of this statute on the ground that it is unconstitutional. May the federal court determine the merits of this suit? 
Yes, because the suit involves a dispute over the constitutionality of a federal statute.  Yes, because the plaintiffs seek real relief of a conclusive nature an injunction against enforcement of this statute.  No, because the plaintiffs do not have an interest in the invalidation of this statute that is adequate to ensure that the suit presents an Article III controversy.  No, because a suit for an injunction against enforcement of a criminal statute may not be brought in federal court at any time prior to a bona fide effort to enforce that statute.