The relationship between an entity and it employees gives rise to an ever growing body of law that has been titled Employment Law. Law today emanates from common law which is generally represented in case law, and from statutory law and regulations, which is generally the creation of legislative bodies.
Employment Law by and large is a creature of statutes created to try to regulate the workplace, and a series of cases that interpret the statutes. In your role as managers, or as business employees or owners, you probably will encounter situations in this area more frequently than in any other area of the law.