Give an example of a law that implements an ethical principle. Give an example of a law that enforces a particular group's idea of how people should behave?

One law that implements an ethical principal would be laws regarding murder and theft.  By law, we know that it is unlawful to steal or commit murder.  Ethically, we are obligated to obey such laws.  Commercial law, such as the Uniform Commercial Code, defines rules for economic transactions and contracts.  An example of particular group's enforcements and the idea of how people should behave are many political, religious, or ideological organizations promote laws to require/prohibit certain kinds of behavior that the group considers acceptable.  Some are that: as members of society, we must accept the rules that the legislative process has created so long they are not clear or ethically wrong.  Others argue that, this could be a good policy and is not an ethical obligation.  Some believe that laws regulating personal behavior or voluntary economic transactions violate libertiesand autonomy of the people forced to obey and, hence, are ethically wrong.