Nos. 80-1094, 80-1100 and 80-1101. Argued and Submitted February 6, 1981. Decided August 10, 1981. Rehearings in No. 80-1094 Denied September 14 and November 6, 1981. Lodged with Clerk July 23, 1981. Philip A. DeMassa, San Diego, Cal., for Davis. Donald B. Marks, Marks Brooklier, Beverly Hills, Cal., for Snyder. Arthur Mabry, Los Angeles, Cal., for Montgomery. Eric L. Dobberteen, Asst. U.S. Atty., Los Angeles, Cal., argued for the United States; Andrea Sheridan Ordin, U.S. Atty., Los Angeles, Cal