Underground Railroad: A network of secret routes and safe houses established in United States during early-to-mid-19th century used by African-American slaves to escape into free states or Canada with aid from abolitionists.
Frederick Douglass: An escaped slave who became a prominent activist, author, public speaker; he became leader in the abolitionist movement which sought to end practice of slavery before & during Civil War.
Harriet Tubman: An American abolitionist & political activist who was born into slavery. She made some thirteen missions to rescue approximately seventy enslaved people using network of antislavery activists & safe houses known as Underground Railroad.