A Georgia man who pleaded guilty to federal explosives charges in what prosecutors described as a plot against the government testified in federal court Thursday that two other men accused in the plot aren’t violent and weren’t seriously planning any attacks. Dan Roberts testified in the trial of Ray Adams, 57, and Samuel Crump, 70, before U.S. District Judge Richard Story in Gainesville. Adams and Crump face charges of conspiring and attempting to make ricin.