They are responsible for controlling exports for national security, foreign policy and short supply reasons. They develop export control policies, issue export licenses, and prosecute violators. Documents on Mexican Politics Site offers a large number of academic reports on Mexico's politics and economy. This non-profit research and educational institution conducts comparative legal and transactional studies of the disparate laws, practices and attitudes among countries of the Western Hemisphere desiring to participate in a free trade area. U.S. Customs Service Site within the U.S. Department of the Treasury.
Customs enforces hundreds of laws and international agreements.
The WTO, the successor to GATT, is the only international organization dealing with the global rules of trade between nations. They administer trade agreements, act as a forum for trade negotiations, settle trade disputes, etc.