Both California contract law and tort law allow for legal action when a third party wrongfully interferes with a contract or ongoing business relationship. A type of unfair business practice that occurs when someone intentionally interferes with an established business relationship using unlawful or wrongful means.A cause of action exists for negligent interference with another's prospective business advantage if the defendant acts unreasonably and wrongfully. The court held that a plaintiff asserting a tortious interference claim involving an atwill contract must plead an independently wrongful act. Instead, your remedy in a case of tortious interference lies in your state's contract and tort laws. For example, a competitor may induce a supplier to breach their contract with your business, causing you to suffer damages. And you don't need a written contract to sue for economic interference. A verbal contract is just as binding. A plaintiff may assert a cause of action against a defendant who induces a thirdparty to breach the plaintiff's contract with that third party. Be wrongful apart from the interference with the contract itself.