ship was approximately one year away from a scheduled overhaul.
Through a series of events not germane to this appeal, John Walker came under concentrated surveillance by the Federal Bureau of Investigation (FBI). He was arrested by the FBI on May 20, 1985 after attempting to pass classified defense information to an agent of the Soviet Union. During the surveillance of John Walker and a search of his home following his arrest, FBI agents discovered records which implicated Arthur Walker. FBI agents interrogated Arthur Walker for several days after John Walker’s arrest. Arthur Walker then voluntarily testified before a federal grand jury in Baltimore investigating allegations of espionage against John Walker and his son, Michael Walker. In the course of the FBI interrogation and the grand jury testimony, Arthur Walker admitted to participating in the procurement and transfer of defense documents as described above.
Arthur Walker was subsequently indicted by a federal grand jury in the Eastern District of Virginia. He was tried by the district court without a jury and convicted of two counts of espionagé and one count of conspiracy to commit espionage in violation of 18 U.S.C. § 794(a) and (c). He was also convicted of two counts of obtaining defense documents to be used to the injury of the United States in violation of 18 U.S.C. § 793(b) and two counts of unauthorized possession of defense information in violation of 18 U.S.C. § 793(e).
On appeal, Arthur Walker contends that the district court erred in refusing to dismiss the conspiracy charge under the principle of Wharton’s Rule; that the Govern: ment failed to provide him with notice of the portions of the classified documents upon which it relied as required by the Classified Information Procedures Act, 18 U.S.C. App. § 10; that the district court erred in refusing to dismiss the espionage charges for insufficient evidence; that the district court erred in admitting evidence regarding John Walker’s activities on May 19-20, 1985; and that there was insufficient evidence to support his conviction on each charge.
II.
Generally, a conspiracy to commit an offense and the substantive offense underlying the conspiracy are distinct crimes which do not merge into a single punishable act, and a defendant in a proper case can be prosecuted both for the conspiracy and the substantive offense. Pinkerton v. United States, 328 U.S. 640, 643, 66 S.Ct. 1180, 1182, 90 L.Ed. 1489 (1946). Wharton’s Rule,2 however, provides an exception to this general rule:
An agreement by two persons to commit a particular crime cannot be prosecuted as a conspiracy when the crime is of such a nature as to necessarily require the participation of two persons for its commission.
Iannelli v. United States, 420 U.S. 770, 773 n. 5, 95 S.Ct. 1284, 1288 n. 5, 43 L.Ed.2d 616 (1975) (quoting 1 R. Anderson, Wharton’s Criminal Law and Procedure § 89, at 191 (1957)). Thus, a person cannot be prosecuted for conspiracy to commit adultery, incest, bigamy or dueling — the classic Wharton’s Rule offenses — since the substantive crime necessarily requires concerted criminal activity. Iannelli, 420 U.S. at 782, 95 S.Ct. at 1292.
Walker asserts that his prosecution for espionage, 18 U.S.C. § 794(a), and conspiracy to commit espionage, 18 U.S.C. § 794(c), violates Wharton’s Rule.3 Ac
2
An appellation derived from 2 F. Wharton Criminal Law § 1604, at 1862 (12th ed. 1932).
3
18 U.S.C. § 794(a) and (c) provide: