A secret FBI document cache—“Prohibited Access”—may hold explosive evidence of political cover-ups, misconduct, and a decade of justice corrupted from within. We recently learned of a previously concealed tranche of documents likely to shed new light on the past decade of American political controversies. This potentially earth-shaking information is known as “Prohibited Access.” It was only recently discovered that the FBI’s information system, called Sentinel, had a level of access previously unknown to anyone outside the Bureau and known only to a select few inside. In essence, this was a concealed cache used to hide documents the FBI wanted hidden...