The following excerpt is from Grand Jury Subpoena Served Upon Doe, In re, 759 F.2d 968 (2nd Cir. 1985):
The investigative powers of the grand jury are broad so that it may carry out adequately its task of determining the existence of criminal activity and returning well-founded indictments. Branzburg v. Hayes, 408 U.S. 665, 688 (1972). The grand jury is authorized to subpoena witnesses and to require the production of evidence.
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