The deadly-but-forgotten government gun-running scandal known as “Fast and Furious” has lain dormant for years, thanks to White House stonewalling and media compliance. But newly uncovered e-mails have reopened the case, exposing the anatomy of a coverup by an administration that promised to be the most transparent in history. A federal judge has forced the release of more than 20,000 pages of emails and memos previously locked up under President Obama’s phony executive-privilege claim. A preliminary review shows top Obama officials deliberately obstructing congressional probes into the border gun-running operation. Fast and Furious was a Justice Department program that allowed...