BISMARCK, N.D. (AP) _ Three peace activists accused of vandalizing a Minuteman III missile silo site near Garrison have been convicted by a federal jury of destroying government property. Greg Boertje-Obed, 51, and Michael Walli, 57, both of Duluth, Minn., and Carl Kabat, 72, of St. Louis, admitted during the course of a two-day trial to dressing up as clowns, breaking into the missile silo site June 20, spray-painting messages and splattering blood, and pounding on the lid of the underground silo with hammers. The jury deliberated only about 1½ hours Thursday before convicting the men. The three men, members...