I would say that King probably said that people have a moral right to obey just laws just as they have that same moral right to disobey unjust laws such as the laws of segregation between whites and black Americans in some southern states.
He wrote that when the laws are not truly true to what they are meant to do, then insubordination and civil disobedience is justified His writing the letter was inspired an announcement made by eight white Alabama ministers a couple of days earlier , titled "A Call For Unity,". He conveyed in his letter that though social shameful acts were occurring yet communicated the conviction that the fight against racial isolation ought to be battled exclusively in the courts and not taken onto the roads.
Because the printing press was not invented until later, so before that all books had to be copied by hand. It was very time-consuming and required a lot of skill.
