Hubbard v. Ammerman, 465 F.2d 1169 (5th Cir. 1972), headnote 2. Courts:

United States District Courts have only such jurisdiction as is conferred by an Act of Congress under the Constitution.
[U.S.C.A. Const. art. 3, sec. 2; 28 U.S.C.A. 1344]

[Hubbard v. Ammerman, 465 F.2d 1169 (5th Cir. 1972), headnote 2]

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Graves v. Snead, 541 F.2d 159 (6th Cir. 1976):

The United States district courts are not courts of general jurisdiction. They have no jurisdiction except as prescribed by Congress pursuant to Article III of the Constitution. [many cites omitted]

[Graves v. Snead, 541 F.2d 159 (6th Cir. 1976)]