The concept of justice has changed over time. In ancient societies, people believed that justice was an eye for an eye and a tooth for a tooth type of system. Under this system, those who violated others would suffer the same violation themselves. As time passed, this form of justice began to be seen as unfair by some people who believed that a person should only be punished for their own crime. They came up with the idea of criminal punishment where someone is forced to work off their crime by performing labor or paying money to the victim or victims' family.