Koch Foods Inc. has paid more than $536,000 in fines for immigration violations at its Fairfield, Ohio, poultry processing plant, according to U.S. Immigration and Customs Enforcement.

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The penalties were for failure to fill out and verify certain employment forms, and were imposed after investigations following a 2007 raid on the plant involving 161 immigrants working without legal documentation. Koch hiring personnel did not knowingly break the law, an attorney for the company told the Associated Press.