Here's a dose of some cold, hard truth: As a practical matter it is far from simple to prove a tortious interference with contract claim under New York law. Our New York City business litigation lawyers handle tortious interference with business cases for business of varying disciplines and sizes.A tortious interference with contract claim is only proper when a defendant causes a third-party (not the plaintiff) to breach the underlying contract. Long Island, NY non-compete litigation attorney Jonathan Cooper discusses a very powerful way to defeat a tortious interference claim under NY law. Experienced New York Fraud and Breach of Contract Lawyers. According to law, when a tort is committed, the victim has the option to file a lawsuit against the alleged perpetrator. An Open book and gavel. Tortious interference concept. Further, under New York law, third parties cannot use unlawful means to interfere with an existing or potential contract. A tenant evicted from an apartment in a forcible or unlawful manner can recover triple damages in a legal action against the landlord.