A tortious interference lawsuit allows you to sue the noncontracting person and recover damages for intentional or negligent acts that caused economic harm. Both California contract law and tort law allow for legal action when a third party wrongfully interferes with a contract or ongoing business relationship.This blog talks about the Cal jury instructions and what a Plaintiff has to prove to meet their "burden of proof" in a civil case. A type of unfair business practice that occurs when someone intentionally interferes with an established business relationship using unlawful or wrongful means. Interference with contractual or advantageous relationships is often referred to as tortious interference in California. An actionable claim for interference with contractual relations does not require that the defendant have the specific intent to interfere with a contract. If a third party unfairly interferes with a business contract or relationship and causes damage, a tortious interference claim may be a viable option. The next element to prove is that the defendant used their knowledge with the intent to interfere with or disrupt the contract. Interference with another's contract. It must be established that the other contractual party was persuaded to breach the contract.