While FTZs have existed for some time, in more recent decades their operation has been subject to international agreements, notably those of the World Trade Organization (WTO) and the World Customs Organization (WCO). The possibility of the misuse of FTZs for the purposes of illicit trade, for which the previous chapter provides some solid evidence, has also prompted a number of actors to foster multilateral actions to strengthen the regulation of zone activities. Most have focused on developing recommendations to more effectively combat corruption and money laundering.