The Matthew Shepard and James Byrd Jr. Hate Crimes Prevention Act (2009) is the federal hate-crime statute. Most states have their own hate-crime laws with varying protected categories.
Hate-crime statutes generally enhance penalties for underlying crimes (assault, vandalism, homicide) when motivated by bias. The Supreme Court upheld penalty-enhancement statutes against First Amendment challenge in Wisconsin v. Mitchell (1993).
Defenders argue hate crimes inflict community-wide harm and warrant enhanced penalties as a deterrent and statement of social values. Critics argue penalty enhancements amount to thought-crime prosecution and that existing assault and vandalism laws are sufficient.