Little did they know at the time, but many Mexicans were basically signing contracts to be deported at a later date. Not only was the bracero program, which imported Mexicans for labor, still in effect for the span of Operation Wetback, but many U.S. citizens were deported unfairly, due to their Mexican descent. In some cases, illegal immigrants were deported along with their American-born children, who were by law U.S. citizens. The agents used a wide brush in their criteria for interrogating potential aliens. They adopted the practice of stopping "Mexican-looking" citizens on the street and asking for identification. Of those unfairly deported were political activists and other Mexican American leaders. This combination of actions makes the United States' position rather clear - Mexicans are valuable as a bottom of the ladder labor resource, but are a threat, and therefore should be eradicated from the country, even if it was necessary to stretch the law to do so, for they often hold well-regarded rankings of leadership. Operation Wetback was really a response to the weakening of the contract-labor system that regularized the pool of cheap labor, especially for agribusiness. It was meant to scare the braceros into remaining in their camps and accepting their conditions and, in this way, to preserve the revolving door of reserve surplus labor from Mexico. .
World War II and the postwar period intensified the Mexican migration to the United States, as the demand for cheap agricultural laborers increased. Studies conducted over a period of several years indicate that the Bracero program increased the number of illegal aliens in Texas and the rest of the country. Because of the low wages paid to legal, contracted braceros, many of them ditched their contracts to return home or to work somewhere else for better wages. Increasing complaints from various Mexican officials in the United States and Mexico pressed the Mexican government to overturn the bracero agreement and stop the export of Mexican workers.