Jury nullification
Jury nullification can be a way for a jury to express their own prejudice and bias. Examples include all-white juries enforcing Jim Crow laws on black defendants while letting white defendants who committed racial crimes against blacks go free. Also, it can seem unfair to allow one defendant to go free for committing the same crime while another defendant is convicted, just because one jury decided to nullify the law. This challenges the concept of equal protection under Fourteenth Amendment.