Entity A falsely accuses in a formal complaint with a large E-Commerce website, a retailer or group of retailers of knowingly selling counterfeit goods, for entity A's own benefit. Entity A files no police reports, and does not contact the accused retailers. Entity A knows that this action will indirectly (through existing procedure E-Commerce company already has in place) have negative financial consequences toward the retailer or retailers in question.
What are Entity A's possible negative legal consequences for making such an accusation falsely, if any?
Jurisdiction: I don't understand jurisdictions very well, so in my hypothetical case it might be California, it might be Washington, or might be any number of locations in the United States. If my lack of understanding makes this question too broad, I would request assistance in better understanding jurisdictional authority in a situation like this.
Assume for this question, that Entity A has the right to represent the good or goods in question, and would plausibly have reason to complain against actual counterfeiting.