Standing trial is Cliven Bundy, 71, his sons, Ammon and Ryan Bundy, who also led last year’s Oregon occupation, and a fourth defendant, Ryan Payne, a Montana resident linked by prosecutors to a militia group called Operation Mutual Aid.A would-be fifth trial defendant, internet blogger and radio host Peter Santilli, pleaded guilty on Oct. 6 to conspiracy and faces a possible six-year prison term.