"Breach of Contract" includes almost any kind of business dispute involving buyers and sellers of good or services, sometimes including even fraud and "white-collar" thievery.
Landlord-Tenant law is a narrow area of contact with very strict deadlines, so if you are served papers, don't delay in responding.
Most agreements between employers and employees are not "contracts" because in the U.S. such relationships are "at will" which means they can be terminated at any time. But there are many contracts between businesses for services, which operate like employer-employee agreements.
If you feel you've been swindled, don't hesitate to call for a free consultation.