There is a good site for Supreme Court cases:
   [1]https://www.law.cornell.edu/supremecourt/text/home
   A good case on jurisdiction is
   [2]https://www.law.cornell.edu/supremecourt/text/96-643   "Steel Co. v.
   Citizens for a Better Environment". (1998)
   From the syllabus (which is not part of the actual decision):
   "(b) This Court declines to endorse the “doctrine of hypothetical
   jurisdiction,” under which several Courts of Appeals have found it
   proper to proceed immediately to the merits question, despite
   jurisdictional objections, at least where (1) the merits question is
   more readily resolved, and (2) the prevailing party on the merits would
   be the same as the prevailing party were jurisdiction denied. That
   doctrine carries the courts beyond the bounds of authorized judicial
   action and thus offends fundamental separation-of-powers principles. In
   a long and venerable line of cases, this Court has held that, without
   proper jurisdiction, a court cannot proceed at all, but can only note
   the jurisdictional defect and dismiss the suit. See,
   e.g., Capron v. Van Noorden , 2 Cranch 126; Arizonans for Official
   English v. Arizona, 520 U. S. ___, ___. Bell v. Hood ,supra ; National
   Railroad Passenger Corp. v. National Assn. of Railroad
   Passengers, [3]414 U. S. 453; Norton v. Mathews, [4]427 U. S.
   524;Secretary of Navy v. Avrech, [5]418 U. S. 676 (per curiam); United
   States v. Augenblick, [6]393 U. S. 348; Philbrook v. Glodgett, [7]421
   U. S. 707; and Chandler v. Judicial Council of Tenth Circuit, [8]398 U.
   S. 74, distinguished. For a court to pronounce upon a law’s meaning or
   constitutionality when it has no jurisdiction to do so is, by very
   definition, an ultra vires act. Pp. 8–17."
              Jim Bell
     __________________________________________________________________

   From: Zenaan Harkness <zen@freedbms.net>
   To: cypherpunks@cpunks.org
   Sent: Wednesday, June 1, 2016 10:32 PM
   Subject: How to download the full ruling of USA Supreme Court cases?
   Can this be done?
   For example, this quote and "case" reference, should have some context:
   "Jurisdiction, once challenged, cannot be assumed and must be
   decided." [Maine v. Thiboutot, 100 S. Ct. 250]
   How do I find the document containing that quote?
   That quote and reference can be found by google on many sites in many
   documents, but only as the quote - the full source document/ ruling
   would provide the context, which would be more useful.
   Some examples of URLs with the above quote (besides many others):
   [9]http://freedom-school.com/lewis-mohr/bowden-petition-and-challenge-t
   o-jurisdiction.pdf
   [10]http://www.nationallibertyalliance.org/how-beat-any-court-case
   [11]http://thegetjusticecoalition.blogspot.com/2007/05/cp-6.html

References

   1. https://www.law.cornell.edu/supremecourt/text/home
   2. https://www.law.cornell.edu/supremecourt/text/96-643
   3. http://www.law.cornell.edu/supremecourt//text/414/453
   4. http://www.law.cornell.edu/supremecourt//text/427/524
   5. http://www.law.cornell.edu/supremecourt//text/418/676
   6. http://www.law.cornell.edu/supremecourt//text/393/348
   7. http://www.law.cornell.edu/supremecourt//text/421/707
   8. http://www.law.cornell.edu/supremecourt//text/398/74
   9. http://freedom-school.com/lewis-mohr/bowden-petition-and-challenge-to-jurisdiction.pdf
  10. http://www.nationallibertyalliance.org/how-beat-any-court-case
  11. http://thegetjusticecoalition.blogspot.com/2007/05/cp-6.html