Does the Attorney General have authority to convene a grand jury?

6 The use of United States v. White, 322 U.S. 694, 64 S.Ct. 1248, 88 L.Ed. 1542, as an authority in this type of case is unjustified. The grand jury is an instrumentality of a court, which has general jurisdiction over crimes supposed or alleged to have been committed. An executive agency has no such power. The agency is bound by the limitations of the statute. The grand jury is untrammeled in investigating federal crimes within the District so long as due process and other constitutional guaranties are accorded witnesses and defendants, without limit.