Criminal law is the body of law that relates to crime. It proscribes conduct perceived as threatening, harmful, or otherwise endangering to the property, health, safety, and moral welfare of people inclusive of one's self. Protecting individuals and property. Criminal law protects citizens from criminals who would inflict physical harm on others or take their worldly goods. Because of the importance of property in capitalist America, many criminal laws are intended to punish those who steal. Providing for smooth functioning of society.