In accordance with US trademark law, disparagement is a legal basis for requesting the cancellation of a trademark registration that "may disparage or falsely suggest a connection with persons, living or dead, institutions, beliefs, or national symbols, or bring them into contempt or disrepute."
This request must be made to the Trademark Trial and Appeal Board (TTAB) of the Patent and Trademark Office (PTO). The disparagement clause was declared unlawful by the Supreme Court in Matal v. Tam in 2017.
According to how the TTAB has read the Lanham Act, parties who assert they could be harmed by a mark have broad standing.
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