Martin Luther King Jr. spearheaded a movement that did an awful lot of good. Unfortunately, toward the end of his life he began to lean to the far Left on some issues, but that doesn’t change the good he accomplished.
Still, Sainthood requires more than bringing an end to desegregation and legalized bigotry. It also requires a “heroic” degree of personal sanctity, which I don’t think that Dr. King would claim for himself if he were still living.
The Catholic church does hold an annual mass in his honor in most dioceses.
Jaypeeto3