The answer to the crossword clue “Antitrust Lawsuit Perhaps” is “MONOPOLY CASE.” An antitrust lawsuit is a legal case that is brought against a company or individual for violating antitrust laws, which are designed to promote fair competition and prevent the formation of monopolies. A monopoly case is a specific type of antitrust lawsuit that is brought against a company that is accused of having a monopoly over a particular market or industry.