Only a couple years ago, manufacturers were fighting for space to relocate their operations to Monterrey, an industrial city in Mexico’s northeast, as they sought to move closer to the US and its vast consumer market.

Several cartel operatives said that for the first time in years, they genuinely feared arrest or death at the hands of the authorities.

President Trump says he'll impose tariffs on Mexico and Canada on Tuesday. Mexico is working hard to persuade Trump to hold off on the threat.