USCIS, USICE, USCBP

Immigration services are provided by three bureaus that are part of the United States Department of Homeland Security. The names of the bureaus are:

United States Citizenship and Immigration Services
United States Citizenship and Immigration Services (USCIS) can assist you with information on the various application processes for federal immigrant benefits. Items such as work cards, green cards, travel documents, relative petitions, and citizenship are processed by USCIS.
United States Immigration and Customs Enforcement
The United States Immigration and Customs Enforcement (USICE) has a mission of enforcing the immigration laws. This bureau investigates immigrant cases that involve criminal activity. In addition, USICE is also responsible for detaining and removing immigrants that are out of legal status and/or have been ordered to be deported to another country.
United States Customs and Border Protection
The United States Customs and Border Protection (USCBP) has the task of inspecting customers and goods at United States ports of entry. Ports of entry include airports, seaports, and land ports of entry into the United States of America. Most local inspectors are located at the Minneapolis Saint Paul International Airport.