Uline, a Wisconsin-based office supply company owned by one of Donald Trump’s biggest financial backers, paid workers it brought from Mexico to work at its US warehouses just a fraction of what their US counterparts were paid, according to four sources who spoke to the Guardian. --- The Mexican workers traveled to the US using tourist visas and visas meant for employees who enter the US temporarily to receive professional training, known as B1 visas, and not for regular work. Sources with direct knowledge of the matter alleged the Mexican employees stayed for one to six months and performed normal work at the company. --- “They weren’t allowed to wear hats or gloves of any kind, because the manager said it broke code. There were times, in winter in Wisconsin, when it’s single digits at night,” the person said. “And if they got caught wearing them, they were told to take them off. If they were caught a second time, they were told to go home and then wouldn’t come back.” The person added: “They did not treat them like human beings.”