The raids revealed that the farms violate Mexican law and retailers' rules by withholding workers' wages until the end of the harvest and systematically denying them social security benefits.
The raids followed an increase in public awareness of labor camp life, and have been widely covered by the media, LA Times said.
However, the newspaper cited Mexican human rights advocate Margarita Nemecio as saying that the government launched raids only to give the public an impression of a fight against the practice.
She argued that current measures are ineffective, since most raids are announced in advance, allowing growers to clean up their facilities.
The Mexican inspections of export farms started in early March. Since then, at least three labor camps have been raided by authorities.
