Both California contract law and tort law allow for legal action when a third party wrongfully interferes with a contract or ongoing business relationship. The court held that a plaintiff asserting a tortious interference claim involving an atwill contract must plead an independently wrongful act.California courts have long recognized causes of action for tortious interference with contract and tortious interference with prospective economic advantage. A tortious interference lawsuit allows you to sue the noncontracting person and recover damages for intentional or negligent acts that caused economic harm. A recent California Court of Appeals case held that a property owner can be liable for tortious interference with a subcontract. When you have a contract, but a third party interferes and causes the other side to breach it, it could be "tortious interference. California Supreme Court Clarifies Pleading Requirements for Claims of Tortious Interference with AtWill Contracts. How do I request a waiver of court fees? (2) in a manner highly offensive to a reasonable person. Cases. (2) in a manner highly offensive to a reasonable person. Cases.