Answer:
Postconventional stage
Step-by-step explanation:
At the third stage of Kohlberg's morality, people decided based on what they personally think is right as opposed to established rules. In other words, postconventional morality is based on human rights and respect for individual liberty. The people breaking state laws did so out of their own beliefs that the contemporary treatment of Black people was unfair. Therefore, they did not care about the rules that were in place but acted according to their own sense of justice, which is in line with the postconventional stage. Hope this helps!