Albert Rivera knows well how dangerous Mexico can be: He sometimes wears a bulletproof vest around the compound of bright yellow buildings that he built into one of the nation's largest migrant shelters.
His phone stores more evidence in the form of stomach-churning videos that gangs sent migrants to warn of consequences for disobeying demands. The images include severed limbs being thrown in a pile, a decapitated head getting tossed in a barrel of steaming liquid and a woman squirming while her head is sawed off.
