The Waumbeck and Humboldt Avenue Hill section of Roxbury was the neighborhood in Boston where high-class, educated "Negroes" lived. Malcolm X describes them as brainwashed, because they would take extreme measures to imitate white people and would look down their noses at the black people living in the ghetto, which wasn't that far off.
They would take pride in working in banking or security or law, when they just may have been "bank janitor, or bond-house messenger".