A trust, pool, or other association of two or more individuals or corporations having for its object to monopolize the manufacture or traflic in a particular commodity, to regulate or control the output, restrict the sale, establish and maintain the price, stifle or exclude competition, or otherwise to interfere with the normal course of trade under conditions of free competition. Northern Securities Co. v. U. S., 193 U. S. 197, 24 Sup. Ct. 430, 48 L. Ed. 679; U. S. v. Knight Co., 156 U. S. 1, 15 Sup. Ct. 249, 39 L. Ed. 325; Texas Brewing Co. v. Templeman, 90 Tex. 277, 38 S. W. 27; U. S. v. Patterson (C. C.) 55 Fed. 005; State v. Continental Tobacco Co., 177 Mo. 1, 75 S. W. 737.