There are some crimes so heinous, barbaric, and brutal that they are considered Crimes Against Humanity. One definition of crimes against humanity is the following.
Odious offences in that they constitute a serious attack on human dignity or grave humiliation or a degradation of one or more human beings. They are not isolated or sporadic events, but are part either of a government policy or of a wide practice of atrocities tolerated or condoned by a government or a de facto authority.
A crime is a breach or break of a rule or law but what is lawful is not necessary what is considered morally acceptable. Some laws, can themselves, be considered crimes against humanity and had lead to some of the worst atrocities ever committed. Arizona Senate Bill 1070, signed into Law by Governor Brewer, is such a law that it can be viewed systematic, institutionalize, and codified “attack on human dignity or grave humiliation or a degradation of one or more human beings.” SB 1070 is biased, it is not meant to be enforced equally, it is targeted on a particular ethnic group, it is blatantly xenophobic, it is reminiscent of Jim Crow Laws.
The the pages of history, there have been a few instances of Laws Against Humanity. Such laws that have degragated the human condition include Nuremberg Laws, Anti-Miscegenation Laws, Jim Crow Laws, Chinese Exclusion Act.