From article above:

According to a former consultant to the bakery, MSI paid the black workers $14 an hour, versus the $10 an hour the Mexican workers were making through Labor Network.

The consultant, Felix Okwusa, says the bakery offered its remaining Hispanic workers a $1-an-hour premium to train the black replacement workers.

But Okwusa says Cloverhill soon ran into problems. In a memo to the company, Okwusa, who is African American, wrote that the black workers “displayed a higher turnover rate of over 40 percent and a lower efficiency rate than their Hispanic co-workers.”