At 10 A.M. on her last day of work, Vanita Gupta, the head of the Civil Rights Division at the Justice Department, opened a door in her office and stepped out into a conference room with cream-colored walls and a fireplace at one end. This room was once the office of the F.B.I. director J. Edgar Hoover, but now the Civil Rights Division uses it for meetings. That morning, Gupta and her senior leadership filed in. Before they took their seats, however, somebody noticed that the official portraits of President Obama and Attorney General Loretta Lynch had vanished. Now there was a bare spot on the wall; everyone stared at the two brass hooks. “When did the pictures come down?” Gupta asked.