This section of the magazine gathers several articles addressing the topic of illicit financial flows (IFFs), including its links to the smuggling of minerals such as gold. The first article gives an overview of the discussions which took place during the WCO Conference on Illicit Financial Flows and Trade Mis-Invoicing that was held in May 2018. A second article introduces the German Customs organizational structure and work processes to detect IFFs and fight the concealment of the proceeds of fraud and crime. The third article describes how a joint portal for Customs verification of minerals will contribute to fighting the smuggling of minerals, in particular gold, and related IFFs. Last but not least, a fourth article explains how the production and trade in gold is organized in Burkina Faso and the challenges faced in fighting gold smuggling.