On January 11, 1979, Albert and Viktor Benson were indicted for conspiracy to commit arson. On May 17, 1982, the defendants filed a motion in the Superior Court to dismiss the indictment. They alleged that, having been acquitted previously on the substantive charges of arson and of breaking and entering in the nighttime with the intent to commit arson, the doctrine of collateral estoppel bars the prosecution of the defendants for the crime of conspiracy to commit arson. In the alternative, the defendants allege that the Commonwealth is precluded by the principles of collateral estoppel from relitigating all facts and issues necessarily determined in their favor at the prior trial.
See Ashe
v.
Swenson,
*475
While the defendants correctly state the proposition that the principles of collateral estoppel are embodied in the Fifth Amendment guarantee against double jeopardy,
Ashe
v.
Swenson, supra,
and are therefore enforceable against the Commonwealth through the Fourteenth Amendment,
Benton
v.
Maryland,
We summarize the facts. On the evening of December 20, 1978, State police observed Albert and Viktor Benson entering an office building in Boston. Shortly after they left the building, it burst into flames. The Bensons were arrested and indicted on identical charges of arson, breaking and entering in the nighttime with the intent to commit arson, and conspiracy to commit arson. The Commonwealth first prosecuted the defendants for the substantive crimes. 3 The jury returned general verdicts acquitting the defendants of the substantive crimes of arson, and breaking and entering with the intent to commit arson.
The Commonwealth subsequently undertook to renew proceedings on the conspiracy indictment. In October, 1979, the defendants filed their first motion to dismiss the conspiracy indictment based on the Commonwealth’s acknowledgment that (1) it had no direct evidence of the ex *476 istence of conspiracy, (2) it had no evidence that a conspiracy had occurred on any date other than that of the fire, and (3) it could not identify any alleged coconspirators other than the defendants. A Superior Court judge denied the relief sought by the defendants.
Through later pleadings, filed on March 14, 1980, the Commonwealth indicated that it intended to introduce evidence of three other fires and the alleged involvement of the defendants therein. The defendants, in response, successfully moved for an order barring the Commonwealth from introducing such evidence. The defendants also filed a motion in limine seeking to preclude the Commonwealth from relitigating, at the conspiracy trial, all facts and issues necessarily determined against it by the prior acquittal of the deféndants on the substantive charges. A renewed motion to dismiss was filed also on the same principles of collateral estoppel. The trial memorandum filed by the Commonwealth at the request of the court summarized the evidence the Commonwealth intends to introduce at the conspiracy trial. 4 Both motions were denied. Thereafter the defendants filed an application with a single justice of this court for leave to file an interlocutory appeal in the Supreme Judicial Court. After a hearing, the application was denied without prejudice, allowing the defendants to renew their contentions during the course of the trial.
The defendants then filed a petition for a writ of habeas corpus, pursuant to 28 U.S.C. §§ 2241 and 2254 (1976), and a complaint for declaratory and injunctive relief, pursuant to 42 U.S.C. § 1983 (1976 & Supp. V 1981), in the United States District Court for the District of Massachusetts. Both
*477
remedies sought were grounded on the claim of collateral estoppel. Concluding that the Bensons had exhausted their State remedies, the United States District Court for the District of Massachusetts nevertheless denied the petition for habeas corpus and complaint for injunctive relief, but declared that “the Commonwealth will be foreclosed from claiming or arguing that [the Bensons] set the fire in the building or that they did aid, counsel or procure the burning of the building. However, that alone would not be enough to bar prosecution of the conspiracy indictment . . . .” Amendment of memorandum of decision dated February 26, 1981 (March 6, 1981), for
Benson
v.
Superior Court Dep’t of the Trial Court,
The defendants then filed a petition for relief by the Supreme Judicial Court pursuant to its supervisory power. G. L. c. 211, § 3. After a hearing, a single justice continued the action, pending the defendants’ filing a motion in the Superior Court to reserve and report a motion to dismiss. On May 17, 1982, the defendants filed with the Superior Court the motion to dismiss now before us. It is this motion which is here on the reservation and report.
*478
The parties argue a variety of legal issues. We consider only those dispositive of the report. Collateral estoppel is an established rule of criminal law. See
Ashe
v.
Swenson,
We first consider whether the acquittal of the defendants on the substantive charges of arson, and breaking and enter *479 ing with the intent to commit arson, bars completely the prosecution for a conspiracy to commit arson. We conclude that the subsequent prosecution for conspiracy is not barred.
It long has been settled that “[a] ‘substantive offence and a conspiracy to commit that offence’ each constitute a ‘distinct offence and each may be separately punished.’ ”
Commonwealth
v.
French,
We next consider whether the introduction of evidence to create inferences that the defendants set the fire, or aided, caused, counseled, or procured the burning of the building is barred because such evidence relates to facts which were necessarily determined in the Bensons’ favor by the general verdict of not guilty of the substantive charges of arson, but which the Commonwealth would have to prove for a conspiracy conviction. We conclude that there is no bar to such evidence. 7
Although the Commonwealth has admitted that it has no direct evidence of a conspiracy, its trial memorandum indicates that it intends to prove the charge by circumstantial evidence. Such a method of proof is generally consistent with accepted practice. See
Attorney Gen.
v.
Tufts,
The defendants, however, have failed to recognize the “difficulties often encountered with respect to a general verdict of ‘not guilty.’”
8
Id.
at 913. The defendants’reliance on
United States
v.
Kramer, supra,
is misplaced.
“Kramer
was the rare case where it was possible to determine with certainty what the jury in the earlier prosecution had decided.”
United States
v.
Cioffi,
The principles of collateral estoppel are inapplicable to the evidentiary facts of the prior trial because of the tenuous and speculative relationship between the result in the prior *482 proceeding and the evidence proposed to be presented in the subsequent prosecution.
The answers to the questions reported are: (1) “No”; (2) “No”; (3) “No.” The case is to stand for trial.
Notes
The report is of the case, together with the following questions:
“(1) Whether, under the circumstances of this case, the doctrine of collateral estoppel, as embodied in the double jeopardy clause of the Fifth Amendment to the Constitution of the United States, bars the prosecution of the defendants for the crime of conspiracy to commit arson?
“(2) Whether, alternatively, that doctrine bars the relitigation of all facts and issues that were necessarily determined in the defendants’ favor at their trial on the indictment charging the substantive crime of arson?
“(3) Given that the only evidence which the Commonwealth can and will adduce at the trial of the defendants on a conspiracy-to-commit-arson indictment is that evidence which the Commonwealth by memorandum *475 asserted it will produce, and nothing more, whether such a trial of the defendants, acquitted on substantive arson indictments involving the same property, is now barred by double jeopardy or collateral estoppel principles?”
At the time, the Commonwealth was statutorily prohibited from trying the substantive crimes at the same time it tried the defendants for conspiracy to commit the same substantive offenses. G. L. c. 278, § 2A, repealed by St. 1979, c. 344, § 43. The prohibition found in G. L. c. 278, § 2A, is now found in Mass. R. Crim. P. 9(e),
The affidavit filed by the defendants in support of the motion in limine was treated by the motion judge as a more precise recitation of the proposed evidence of the Commonwealth. The defendants maintain that the Commonwealth’s trial memorandum, together with the Commonwealth’s March 14 pleading, which a judge held contained inadmissible evidence, are the only documents of record suggesting the nature of the evidence to be introduced by the Commonwealth if it is allowed to proceed with the conspiracy trial.
The denial of the writ of habeas corpus was affirmed because of the view of the Court of Appeals that the defendants had not exhausted their State remedies.
See
Commonwealth
v.
Lopez,
On this point, we note that both the District Court judge and the Court of Appeals reached the same conclusion. See
Benson I,
One commentator has described the examination of the previous prosecution to determine the issue on which a rational jury based its verdict as the “doctrine of ‘reasonable speculation.’” Note, Twice in Jeopardy, 75 Yale L.J. 267, 284-285 (1965).
We note that the Commonwealth represents in its brief that it will not seek to prove that the defendants set the fire and will ask that the jury be told of the acquittal of the defendants on the substantive charges. Such a charge may be appropriate, if the defendants assent.
