United States Customs Service
Overview
Until March 2003, the United States Customs Service was an agency of the U.S. federal government
Federal government of the United States
The federal government of the United States is the national government of the constitutional republic of fifty states that is the United States of America. The federal government comprises three distinct branches of government: a legislative, an executive and a judiciary. These branches and...

 that collected import tariffs and performed other selected border security duties.

Before it was rolled into form part of the U.S. Department of Homeland Security as the Bureau of Customs and Border Protection
U.S. Customs and Border Protection
U.S. Customs and Border Protection is a federal law enforcement agency of the United States Department of Homeland Security charged with regulating and facilitating international trade, collecting import duties, and enforcing U.S. regulations, including trade, customs and immigration. CBP is the...

 and Immigration and Customs Enforcement, the United States Customs Service had three major missions: collecting tariff revenue, protecting the U.S.
 
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