In the last 17 months since the U.S. government financially blacklisted the Haqqani Network, one of the deadliest insurgent groups in Afghanistan and Pakistan, not a single dollar associated with the group has been blocked or frozen, according to U.S. officials and one of the Congressman who oversees the Treasury Department’s financial war on terrorism. But it’s not just the Haqqanis—an ally today in the Taliban’s fight against U.S. troops and the Afghan government—who seem to have been spared from America’s economic attacks. According to a Treasury Department letter written in late November, not a single dollar been seized from...