Philadelphia defense firm Swartz Campbell has sued Valley Forge, Pa.-based Chartwell Law Offices over what it claims was the “improper interference with and destruction of” its business interests, client relationships and partnership agreements, largely related to a recent lateral move that resulted in the closing of Swartz Campbell’s Fort Myers, Fla., office and the opening of a Fort Myers location for Chartwell.

The 35-page complaint, filed September 10, comes after Swartz Campbell filed a writ of summons in the Philadelphia Court of Common Pleas’ Commerce Court program August 14 and alleges tortious interference with contract, conversion, aiding and abetting breach of fiduciary duty, misappropriation, unfair competition and civil conspiracy.