¶1The defendant appeals from convictions of conspiracy to commit mayhem and conspiracy to commit assault and battery by means of a dangerous weapon. The evidence *79favorable to the Commonwealth at trial showed that the defendant engaged one Hathaway to murder George Markos and shoot Konstantinos Travayiakis (“Kostos”) in the knees. The defendant and Hathaway, who were prior acquaintances, had three meetings. At the first, the defendant told Hathaway he had a job for him, that it involved “whacking” Markos and Kostos, and that Hathaway should call the defendant’s pager number. At the second, the defendant picked Hathaway up in Lynn, and the two drove north to Marblehead to a restaurant owned by Kostos. Hathaway entered the restaurant for a short time to familiarize himself with its layout and with Kostos’s appearance. At the third, the two drove again toward Marble-head but were intercepted by police before reaching the vicinity of the restaurant.
¶2Hathaway was a police informer. On the day after the first meeting, he reported to the police what was afoot, and the police observed the second meeting, following the defendant’s car to Marblehead at a safe distance. By the time of the third meeting, the police had obtained a warrant for electronic surveillance
¶3The defendant argues three issues on appeal.
¶41. Validity of the wiretap. The electronic surveillance in this case finds justification not by a warrant under the provisions of G. L. c. 272, § 99 F-M (the police applied under the provisions of G. L. c. 276), but rather under the one-party consent exception of G. L. c. 272, § 99 B 4. See Commonwealth v. Zuluaga, 43 Mass. App. Ct. 629, 633-634 (1997). Under that exception, a tap consented to by one party to a conversation (here, Hathaway) will be upheld if police are investigating a “designated offense” occurring in connection with “organized crime.” See Commonwealth v. Thorpe, 384 Mass. 271, 276 (1981), cert. denied, 454 U.S. 1147 (1982). “Designated offense[s]” are enumerated in G. L. c. 272, § 99 B 7; they include assault and *80battery with a dangerous weapon, murder, and solicitation to commit either of the two. The connection with organized crime was adequately suggested by several aspects of Hathaway’s description of the proposition put to him by the defendant, most particularly that the defendant did not have any dealings with or even know Kostos but had been hired to kill him by someone else who would be paying for the hit
¶5Because the transmission and recording of the third meeting between the defendant and Hathaway were in conformity with the one-party consent exception to the general ban on surreptitious recording, the tape of the conversation was properly received in evidence and played for the jury.
¶62. Motion for required findings. The trial judge, agreeing with the defendant’s position that a conspiracy was not shown if the only two participants in the plan were the defendant and Hathaway,
¶7*81On appeal the defendant makes an argument that was not made to the trial judge: namely, that the two indictments that were submitted to the jury each lacked supporting evidence sufficient to convict because of the corroboration rule adopted in Commonwealth v. Forde, 392 Mass. 453, 457-458 (1984). The rule relates to confessions and admissions; its purpose is to “preclude!] the possibility of conviction of [a] crime based solely on statements made by a person suffering a mental or emotional disturbance or some other aberration.” Id. at 457. The rule requires “some evidence, besides the confession . . . that the crime was real and not imaginary.” Commonwealth v. Manning, 41 Mass. App. Ct. 18, 21 (1996), quoting from Commonwealth v. Forde, 392 Mass. at 458.
¶8It is doubtful that the corroboration rule applies to statements made in active furtherance of a criminal plan, as contrasted with statements admitting or suggesting complicity in a completed crime. Even if applicable, the central purpose of the rule is met here. In addition to Hathaway’s testimony, abundantly corroborated by the tape recording,
¶9The judgment on the charge of conspiracy to commit mayhem is affirmed. The judgment on the charge of conspiracy to commit assault and battery by means of a dangerous weapon, being duplicative of the mayhem conspiracy, is vacated,
¶10So ordered.
¶11As the interception did not take place in a private residence, it is doubtful that a warrant was required under Commonwealth v. Blood, 400 Mass. 61 (1987). See Commonwealth v. Remedor, 52 Mass. App. Ct. 694, 698 n.3 (2001), and cases cited.
¶12It was not until the third and final meeting that the defendant told Hathaway that he was not to kill Kostos but only to shoot him in the knees.
¶13On the “bilateral theory of conspiracy,” described in Commonwealth v. Themelis, 22 Mass. App. Ct. 754, 757-760 (1986), Hathaway could not be found to be a coconspirator because he did not intend to participate in the plan but rather to feign participation and expose it. In the Themelisappeal, we were not required to decide whether Massachusetts subscribes to the bilateral theory, and we are similarly not required to decide the question in this appeal.
¶14The transcript of the tape recording that was prepared by the Commonwealth is not part of the record, but the tape itself was put in evidence as an exhibit. We have listened to the tape, and it bears out in pertinent respects the accuracy of the transcript prepared by the Commonwealth.
¶15The Commonwealth has conceded that the battery conspiracy is duplicative of the mayhem conspiracy, which was charged under the second branch of the mayhem statute, G. L. c. 265, § 14. The reasons are explained in Commonwealth v. Martin, 425 Mass. 718, 721-722 (1997). See also Commonwealth v. Simpson, 428 Mass. 646, 655 (1999).