What is tortious interference with a business contract? How does one make a legal claim?In their fourth claim for relief, plaintiffs allege that MCA tortiously interfered with their contractual and business relationships with Brindle and Complex. If a third party unfairly interferes with a business contract or relationship and causes damage, a tortious interference claim may be a viable option. "improper means or methods. Contemporary also asserts in the Complaint a state law claim for tortious interference with a business relationship. What this means is that they must have known about the contractual relationship and caused the breach anyway. CA200203033, 2002Ohio5147, ¶23. CA200203033, 2002Ohio5147, ¶23. Can I sue for defamation (and tortious interference with my business) when they spread lies and incite others to harass me?