How about Frederick Douglas, (1818-1895); seems sooo many have forgotten of his ties to most of Our Forefathers. He escaped from Slavery and became an outspoken critic on abolition. Even J. Brown spent the night at Douglas home, just prior to Brown launching his attack at Harper's Ferry, which Douglas did NOT agree with..
Without his approval, Douglass became the first African American nominated for Vice President of the United States as the running mate and Vice Presidential nominee of Victoria Woodhull on the radical and visionary Equal Rights Party ticket
https://en.wikipedia.org/wiki/Frederick_Douglass
He not only was an abolitionist, but also a strong voice for Women's Suffrage; was sent to Ireland to "cool off", and became involved with Ireland's Potato Famine........
However IMO, Lincoln's biggest mistake was not giving all Slaves a One Way Ticket back home........