Operation Wetback was an immigration law enforcement initiative created by Joseph Swing, the Director of the United States Immigration and Naturalization Service (INS), in cooperation with the Mexican government. The program was implemented in May 1954 by U.S. Attorney General Herbert Brownell and utilized special tactics to deal with illegal border crossings into the United States by Mexican nationals. The program became a contentious issue in Mexico–United States relations, even though it originated from a request by the Mexican government to stop the illegal entry of Mexican laborers into the United States. Legal entry of Mexican workers for employment was at the time controlled by the Bracero program, established during World War II by an agreement between the U.S. and Mexican governments. Operation Wetback was primarily a response to pressure from a broad coalition of farmers and business interests concerned with the effects of Mexican immigrants living in the United States without legal permission. Upon implementation, Operation Wetback gave rise to arrests and deportations by the U.S. Border Patrol.
The name "wetback" was a disparaging term applied to illegal entrants who supposedly entered the United States by swimming the Rio Grande. It became a derogatory term applied generally to Mexican laborers, including those who were legal residents.[40] Similarly, the 1855 Greaser Act was so-known based on the anti-Mexican slur "greaser".
One of the biggest problems caused by the program for the deportees was sending them to unfamiliar parts of Mexico, where they would struggle to find their way home or to continue to support their families. More than 25% of apprehended Mexicans were returned to Veracruz on cargo ships, while others were transported by land to southern cities in Mexico. Those apprehended were often deported without receiving the opportunity to recover their property in the United States, or to contact their families (at least, for the time being). They were often stranded without any food or employment when they were released in Mexico. Deported Mexicans sometimes faced extreme conditions in their country; 88 deported workers died in the 112 °F (44 °C) heat in July 1955.