https://en.m.wikipedia.org/wiki/Operation_Wetback
Operation Wetback was a system of tactical control and cooperation within the U.S. Border Patrol and alongside the Mexican government. [30] Planning between the INS led by Gen. Joseph Swing and the Mexican government began in early 1954 while the program was formally announced in May 1954. [31] On May 17th,1954,command teams of 12 Border Patrol agents, buses,planes,and temporary processing stations began locating, processing,and deporting Mexicans that had illegally entered the United States. 750 immigration and border patrol officers and investigators,300 jeeps,cars and buses,and 7 airplanes were allocated for the operation. [32]
Teams were focused on quick processing and deportation,as planes were able to coordinate ground efforts more quickly and increase mobility. [33]
Those deported were handed off to Mexican officials,who in turn deported them into central Mexico where there were many labor opportunities. [34]
While the operation would include the cities of Los Angeles,San Francisco, and Chicago,its main targets were border areas in Texas and California. [35]
Overall,there were 1,078,168 apprehensions made in the first year of Operation Wetback,with 170,000 being captured from May to July 1954. [36]
The total number of apprehensions would fall to just 242,608 in 1955,and would continuously decline by year until 1962,when there was a slight rise in apprehended workers.