"Disparagement" is defined by the Restatement of the Law of Torts as "matter which is intended by its publisher to be understood to cast doubt upon the existence or extent of another's property in land, chattels or intangible things, or upon their quality .. ." The act has been similarly designated as "Injurious Falsehood" and "Trade Libel." Simply stated, it is "knocking the competitor," an act as old as competitive business and one which takes on new significance in this age of effective and far-reaching communications.
Edward L. Graf,
Disparaging the Product - Are the Remedies Reliable?,
Duq. L. Rev.
Available at: https://dsc.duq.edu/dlr/vol9/iss2/2