What is the test for sustaining a conviction for conspiracy to murder?

[I]n evaluating [such] claim[s], we must view the evidence in the light most favorable to the government and construe all possible inferences in its favor, see, e.g., United States v. Martino, 759 F.2d 998, 1002 (2d Cir.1985). If "any rational trier of fact could have found the essential elements of the crime," the conviction must stand. Jackson v. Virginia, 443 U.S. 307, 319, 99 S.Ct. 2781, 2786, 61 L.Ed.2d 560 (1979) (emphasis in original).

Id. at 828. Furthermore,

It is not for us to weigh the evidence or to determine the credibility of witnesses. The verdict of a jury must be sustained if there is substantial evidence, taking the view most favorable to the Government, to support it. United States v. Manton, 2 Cir., 107 F.2d 834, 839, and cases cited.

Participation in a criminal conspiracy need not be proved by direct evidence; a common purpose and plan may be inferred from a "development and collocation of circumstances." United States v. Manton, supra.