Martin Luther King defends the moral legitimacy of civil disobedience in his Letter From A Birmingham Jail. King argues that injustice doesn’t correct itself, but requires concerted effort, and that we have a moral duty to make such an effort.
Like Socrates, King thought that sometimes justice requires that one challenge the status quo if it is unjust, even if this means putting one’s life on the line as many did during the civil rights movement.