Thomas Mulier, Bloomberg, November 27, 2017

A Swiss maker of hamburger buns for McDonald’s Corp. said it’s struggling to run a Chicago bakery after it lost a third of its workers in a clampdown on 800 immigrants without sufficient documentation.

About 35 percent of the workers at Cloverhill Bakery had to be replaced, according to Zurich-based Aryzta AG. The company, which makes baked goods for fast-food chains and supermarkets, said the employees were supplied by a job-placement agency that faced federal audits earlier this year.

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The raid on workers at Cloverhill is one of the biggest U.S. employment headaches reported by a European company so far, as President Donald Trump has made curbing undocumented immigration a centerpiece of his presidency. Aryzta said it faces challenges in retaining staff in the U.S. and pressure to raise wages.

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Aryzta wasn’t able to verify that the workers had the necessary documents to work because they were brought in by a staffing agency, interim Chief Financial Officer David Wilkinson said in September. He also said the board wasn’t aware of the extent of the risk that existed to the business. The company first reported the loss of 800 workers at that time.

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