An investigative economist has crunched 45 years of official statistics to discover just how much kleptocrats have plundered from 150 mostly poor nations. For the first time we have a reliable estimate of how much money thieving dictators and others have looted from 150 mostly poor nations and hidden offshore: $12.1 trillion. That huge figure equals a nickel on each dollar of global wealth and yet it excludes the wealthiest regions of the planet: America, Canada, Europe, Japan, Australia, and New Zealand. The $12.1 trillion estimate—which amounts to two-thirds of America’s annual GDP being taken out of the economies of...