In “Letter from Birmingham Jail,” Dr. Martin Luther King Jr. explains that the difference between just and unjust laws comes down to moral grounding and human dignity. A just law, he writes, is one that “squares with the moral law or the law of God” and uplifts human personality. An unjust law, by contrast, is one that “degrades human personality” or is inflicted on a minority group without their participation in making the law. In other words, we can tell the difference by asking: Does this law respect people’s humanity, equality, and agency? Or does it diminish and control them?
I think this distinction is extremely important. If people cannot question the morality of laws, then legality becomes the same as justice which history clearly shows is not true. Being able to recognize unjust laws affects both individuals and society because it influences how we respond to authority. Some people might choose civil disobedience, while others push for reform through political participation. These ideas absolutely shape our politics today, especially debates around rights, policing, immigration, reproductive freedom, and voting access.
Using King’s definitions, a just law in the U.S. today would be the Americans with Disabilities Act (ADA). It uplifts human personality by ensuring equal access to jobs, public spaces, and transportation. It expands dignity and participation instead of restricting it.
An example of an unjust law would be voter ID laws that disproportionately impact minority and low-income communities. While they appear neutral on the surface, their impact is unequal, they make it harder for certain groups to participate in shaping the laws that govern them. Under King’s framework, this is unjust because it limits democratic agency and contributes to political inequality.
Overall, MLK’s distinction helps us think more critically about the difference between what is legal and what is right. A question that continues to shape American life and politics today.