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The U.S. Supreme Court held that an agency employee properly refused to produce certain records requested under subpoena by the Attorney General (AG). The subpoena was valid, however, as it was issued in accordance with a regulation issued by the AG and such order was appropriate as authorized by statute and not inconsistent with the law.
http://scholar.google.com/scholar_case?case=13885235100712367872&hl=en&as_sdt=2&as_vis=1&oi=scholarr