The Law and Doing Right by Others

We all remember who MLK Jr. is. The founder of the Civil Rights Movement. The man in essence went against the law of the southern United States and organized rallies and marches to gain freedom for his ethnic group that were brought to America by white people to be slaves. Are there other areas that have not been addressed in America or worldwide that people ought to challenge with regards to the law for the benefit of others? If so, what areas do you believe these areas are?