Calaveras County Sheriff's Capt Jim Macedo says the men fled the secluded, rural camp in July after overhearing they would be murdered after the harvest.
The unidentified victims had bruises and black eyes when they sought help and went to a hospital.
Macedo said yesterday two men were originally hired as day laborers. Two others were taken captive later.
The women were arrested on suspicion of human trafficking, kidnapping, battery with serious bodily injury, terrorist threats, and drug charges.
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