Before the Interstate Commerce Commission, Docket No. 6766: Iowa State Board of Railroad Commissioners, American National Live Stock Association, Corn Belt Meat Producers Association, and Cattle Raisers Association of Texas, Complainants, V. the Atchison, Topeka & Santa Fe Railway Company, Et Al., Defendants, and Board of Railroad Commissioners of South Dakota, National Live Stock Exchange, Military Tract Shippers of Live Stock Associaton, Interveners ; Also Appearing and Asking to Intervene in Behalf of the Complainants, South Omaha Live Stock Exchange, State Railroad Commission of Colorado, American Corporation Commission : Brief and Argument of Complainants