Operation Gatekeeper was a Clinton-era measure implemented by the U.S. Border Patrol, then a part of the Immigration and Naturalization Service, aimed at halting illegal immigration at the United States–Mexico border near San Diego, California. According to the Immigration and Naturalization Service, the goal of Gatekeeper was "to restore integrity and safety to the nation's busiest border."
Operation Gatekeeper was announced in Los Angeles on September 17, 1994, by U.S. Attorney General Janet Reno, and was launched two weeks later on October 1.
The United States Congress allocated additional funds to the United States Border Patrol and other agencies. By 1997, the budget of the Immigration and Naturalization Service had doubled to 800 million dollars, the number of Border Patrol agents had nearly doubled, the amount of fencing or other barriers more than doubled, and the number of underground sensors nearly tripled.
The merits of Operation Gatekeeper were debated extensively, including during Congressional hearings. The Department of Justice, the INS and the Border Patrol maintained that Operation Gatekeeper was a success. Some Congressmen and others sharply criticized the program and declared it a failure.
The first phase of Gatekeeper focused on the 5 5/8 westernmost miles of the border, extending from the Pacific Ocean to the San Ysidro Port of Entry. U.S. migration routes immediately shifted eastward, and the use of professional smugglers increased. In May 1995, the Border Patrol initiated Operation Disruption to target smugglers, known as coyotes or polleros, and also established new checkpoints on interior highways.