Workers at chains like Kroger, Costco, and Waffle House are on the front lines of an increasingly violent war between mask supporters and opponents

Retail workers at chains, including Kroger, Waffle House, and Costco ,are increasingly caught in the crossfire when it comes to enforcing store or state policies on personal protective equipment. Some shoppers refuse to wear masks or face coverings for political reasons.  In some cases, confrontations between store workers and customers have resulted in deadly violence. Visit Business Insider’s homepage for more stories.

Kristine Holtham, a Kroger employee from Lansing, Michigan, recalled the last time she requested that a customer follow store rules and don a mask or face covering. The man refused to comply. Instead, he looked