The Office of Foreign Assets Control of the US Department of Treasury "enforces economic and trade sanctions against targeted foreign countries, terrorism sponsoring organizations and international narcotics traffickers based on U.S. foreign policy and national security goals." Their Website consists of overviews of asset control and/or sanction regulations in countries including Iran, Iraq, Cuba, and Libya. A master list of specially designated nationals and blocked persons (SDN) is organized in alphabetical order, and recent changes to the SDN lists are also included. All files must be downloaded in .pdf format.