An unjust law is no law at all
One has not only a legal but a moral responsibility to obey just laws. Conversely one has a moral responsibility to disobey unjust laws.
[A]n individual who breaks a law that conscience tells him is unjust, and who willingly accepts the penalty of imprisonment in order to arouse the conscience of the community over its injustice, is in reality expressing the highest respect for law.
Injustice anywhere is a threat to justice everywhere.
[T]o delay Justice is Injustice.