If a third party unfairly interferes with a business contract or relationship and causes damage, a tortious interference claim may be a viable option. It is this diversion of machinery upon which plaintiff bases its contention of wrongful interference with contractual relationships.Tortious interference occurs when someone knowingly disrupts a contract or business relationship, causing harm. COMMENT: Defining Improper Conduct. In the Wagenseller case, the supreme court ruled that improper conduct was an element of interference with contract cases. In general, various companies legally compete for business before the buyer selects one and the two parties sign a contract. Count Four: Tortious Business Interference. In Count Four, Plaintiffs allege Defendants Pima County, Sharon Bronson, Chuck. There is a relationship between the challenged. Interference with contractual relations.