Why does Malcolm X not approve of Martin Luther King Jr.'s approach to securing civil rights?

Malcom X wanted people to go back to Africa or from a whole different country without white people in it. Martin Luther King on the other hand wanted non-violent protests to try to get rid of the awful segregation. King said this about malcom x's civil rights movements. "a bunch of thugs organized from prisons and jails and financed, I am sure, by some Arab group." They both wanted the same thing which was freedom but one wanted to integrate with white people, and the other one didn't.