1) Abolitionist 2) Beecher 3) Douglass 4) Stowe 5) Tappan 6) Tubman 
• (n.) An advocate of emancipation, esp. the emancipation of slaves.
E·man`ci·pa'tion·ist noun An advocate of emancipation, esp. the emancipation of slaves. 
emancipationist Someone who advocates emancipation; especially, an advocate of the freeing of human beings from slavery.
a person who advocates emancipation, esp. an advocate of the freeing of human beings from slavery.