Factory workers in Ciudad Juárez rarely go on strike. Their labour rights are so weak that participating in a protest can cost them their job. So when employees at the US-owned Regal motor factory organised a demonstration over having to work during a coronavirus outbreak, Mariana - not her real name - was initially reluctant to take part. Earning barely $80 (£64) a month, she can ill afford to become unemployed at this complicated time. According to Mariana, several workers in the factory died after contracting Covid-19 and that was when she decided that the issue at stake was too important to stay quiet. "Someone who worked very close to us had a high temperature and they sent him home. Six days later he died. And now others have high temperatures," Mariana told me on the telephone from Ciudad Juárez. "We can't risk bringing the virus home. In my case, I have a family member who's diabetic, another with asthma. I'm trying to think of them." Conditions inside the assembly plants, called maquiladoras, are not conducive to preventing the spread of the virus, says Mariana. "There isn't much distance between us on the assembly line and if a machine breaks, they put us all on the same one, right on top of each other."