Saying the Framers of the U.S. Constitution envisioned that the final “interpretation of the laws” would be “the proper and peculiar province of the courts,” the U.S. Supreme Court Friday overturned the Chevron doctrine, potentially sapping the regulating power of government agencies and transferring it to the courts. The widespread ramifications of this decision are likely to impact numerous financial regulatory bodies, including the Department of Labor and its pending fiduciary rule. The...