Generally speaking, the "rule of law" refers to the constitution or implied constitution of a state or country that determines how all laws are made and enacted--something that no law of government action can go against.
Answer: The "powhitetrash" would come into the store and crawl all over the shelves, they'd also crawl into the onion and potato bins. They were smelly, unwashed. Presumably very messy and uncivilized.
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Hope this helps you as much as intended.