OPINION OF THE COURT
In April or May, 1977, FMC Corporation produced a number of documents in response to a subpoena duces tecum issued by a federal grand jury sitting in Philadelphia. Alleging that the government had filed a false Schofield affidavit 1 and had violated *807 Fed.R.Crim.P. 6(e) by disclosing the documents to unauthorized persons, FMC asked for return of the documents. After argument, the district court denied the motion, and FMC appealed. We conclude that the order is nonappealable and- must be dismissed because of a lack of jurisdiction.
Certain exceptions notwithstanding, Congress and the federal courts have announced and adhered to a policy of permitting appeals only from the final decisions of district courts. 28 U.S.C. § 1291;
Cobbledick v. United States,
Notes
. In
In re Grand Jury Proceedings (Schofield I),
when a grand jury subpoena is challenged, it is reasonable “that the Government be required *807 to make some preliminary showing by affidavit that each item is at least relevant to an investigation being conducted by the grand jury and properly within its jurisdiction, and is not sought primarily for another purpose.” In essence, FMC argues that the affidavit submitted to the district court to obtain the subject documents was fraudulent.
