Frank Biden, the youngest brother of former Vice President Joe Biden, saw his business interests benefit from millions of dollars in taxpayer loans to Caribbean nations during the Obama years. The extensive overlap in Frank Biden’s dealings and Obama-Biden foreign policy in Central America is exposed in Peter Schweizer’s new book—Profiles in Corruption: Abuse of Power by America’s Progressive Elite. Frank Biden first set his sights on the region in 2009, as the Obama administration began to repair the U.S. relationship with Costa Rica. Tensions between the two countries flared under President George W. Bush, most notably on how to...