When a coal executive and two lawyers stood trial in Alabama last month for bribery and related crimes, it was clear from the start that things might get uncomfortable for Jeff Sessions. The attorney general’s name, after all, appeared on a list of possible witnesses. Though he was never called to the stand, detailed references to Sessions and key members of his staff thread their way through the record of the four-week trial, which concluded on July 20 when David Roberson, vice president of Drummond Coal, and Joel Gilbert, a partner in the Birmingham-based law firm Balch & Bingham, were found guilty of paying off an Alabama lawmaker to oppose a federal environmental cleanup effort that could have cost Drummond millions.