It’s true
Criminal Law
It’s a crime to make unauthorized and harmful physical contact with another person (battery). In fact, it’s a crime even to threaten such contact (assault). Criminal law prohibits and punishes wrongful conduct, such as assault and battery, murder, robbery, extortion, and fraud. In criminal cases, the plaintiff—the party filing the complaint—is usually a government body acting as a representative of society. The defendant—the party charged in the complaint—may be an individual (such as your roommate) or an organization (such as a business). Criminal punishment includes fines, imprisonment, or both.
Civil Law
Assault and battery may also be a matter of civil law—law governing disputes between private parties (again, individuals or organizations). In civil cases, the plaintiff sues the defendant to obtain compensation for some wrong that the defendant has allegedly done the plaintiff. Thus your roommate may be sued for monetary damages by the homeowner’s neighbor, with whom he made unauthorized and harmful physical contact.
In civil litigation, contract and tort claims are by far the most numerous. The law attempts to adjust for harms done by awarding damages to a successful plaintiff who demonstrates that the defendant was the cause of the plaintiff’s losses. Torts can be intentional torts, negligent torts, or strict liability torts. Employers must be aware that in many circumstances, their employees may create liability in tort.