| http://www.w3.org/ns/prov#value | - `(3) In case of contumacy by, or refusal to obey a subpoena issued to, any person, the Attorney General may invoke the aid of any court of the United States within the jurisdiction of which such investigation or proceeding is carried on, or where such person resides or carries on business, in requiring the attendance and testimony of witnesses and the production of books, papers, or other document
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