In the mid 1800s, a growing number of both black and white, were speaking out against slavery. The Abolitionist Movement began in the Revoltuionary Era, partially in response to the inhumane treatment of slaves and partially in an effort to remove blacks from white society. Two of the best-known black abolitionists were Frederick Douglass and Sojourner Truth. Frederick Douglass an escaped slave, lectured against slavery and quickly became a leader in the abolitionist movement. Sojourner Truth was a former slave who was inspired by Douglass to speak out against the evils of slavery. Harriet Tubman was a conductor on the Underground Railroad ( a secret network of abolitionists that secretly helped runaway slaves to reach freedom in the North and Canada.