A Mexican labourer allowed into the United States for a limited time as a seasonal agricultural worker.A remedy was found in an agreement with the Mexican government in 1942, which brought in some 200,000 Mexican workers - called braceros - on temporary work visas....
The bracero program contracted Mexican agricultural labor to US growers.
This is the most fundamental expression of the growers' advantage in using braceros: a bracero knew he could not complain.
Origin
1970s: Spanish, literally 'labourer', from brazo 'arm'.