In criminal law. A combination or confederacy between two or more persons formed for the purpose of committing, by their joint efforts, some unlawful or criminal act, or some act which is innocent in itself, but becomes unlawful when done by the concerted action of the conspirators, or for the purpose of using criminal or unlawful means to the commission of an act not in itself unlawful. Pettibone v. U. S., 148 U. S. 197, 13 Sup. Ct. 542, 37 L. Ed. 419; State v. Slutz, 106 La. 182, 30 South. 298; Wright v. U. S., 108 Fed. 805, 48 C. C. A. 37; U. S. v. Benson, 70 Fed. 591, 17 C. C. A. 293; Girdner v. Walker, 1 Heisk. (Tenn.) 186; Boutwell v. Marr, 71 Vt. 1, 42 Atl. 607, 43 L. It. A. 803, 76 Am. St. Rep. 746; U. S. v. Weber (C. C.) 114 Fed. 950; Comm. v. Hunt, 4 Mete. (Mass.) Ill, 3S Am. Dec. 340; Erdman v. Mitchell, 207 Pa. 79, 56 Atl. 327, 63 L. R. A. 534, 99 Am. St. Rep. 7S3; Standard Oil Co. v. Doyle, US Ky. 602, 82 S. W. 271, 111 Am. St. Rep. 331. Conspiracy is a consultation or agreement between two or more persons, either falsely to accuse another of a crime punishable by law; or wrongfully to injure or prejudice a third person, or any body of men, in any manner; or to commit any offense punishable by law; or to do any act with intent to prevent the course of justice; or to effect a legal purpose with a corrupt intent, or by improper means. Hawk. P. C. c. 72.