Immigration Enforcement Within the United States

An estimated 11 million unauthorized aliens reside in the United States, and this population is estimated to increase by 500,000 annually. Each year, approximately 1 million aliens are apprehended trying to enter the United States illegally. Although most of these aliens enter the United States for economic opportunities and family reunification, or to avoid civil strife and political unrest, some are criminals, and some may be terrorists. All are violating the United States immigration laws. Immigration enforcement is the regulation of those who violate provisions of the Immigration and Nationality Act (INA). This includes violations of the INA's civil provisions (e.g., violate the conditions of their admittance), as well as U.S. citizens or aliens who violate the criminal provisions (e.g., marriage fraud or alien smuggling). Many divergent tasks are incorporated under the banner of immigration enforcement. These include removing aliens who should not be in the United States, investigating alien smuggling and trafficking, patrolling between and at ports of entry, combating document and benefit fraud, and enforcing the prohibitions against employers hiring aliens without work authorization. Historically, more resources (measured in staff hours) have been allotted to enforcement at the border than enforcement within the United States. While the amount of U.S. Border Patrol (USBP) resources almost doubled between FY1997 and FY2003, time spent on other enforcement activities increased only slightly, while the number of inspection hours decreased. Furthermore, focusing on interior enforcement, in FY2003, the largest amount of staff time was devoted to locating and arresting criminal aliens (39%), followed by administrative and non-investigative duties (23%) and alien smuggling investigations (15%). Only 4% was devoted to worksite enforcement (i.e., locating and arresting aliens working without authorization, and punishing employers who hire such workers).