Emilio [BBR] quotes from a speech of Frederick Douglass which was published in Douglass’s monthly The North Star:

… We can get at the throat of treason and slavery through the State of Massachusetts. She was first in the War of Independence ; first to break the chains of her slaves ; first to make the black man equal before the law ; first to admit colored children to her common schools. She was first to answer with her blood the alarm-cry of the nation when its capital was menaced by thehe Rebels. You know her patriotic Governor, and you know Charles Sumner. I need add no more. Massachusetts now welcomes you as her soldiers. . . .