In the mid 1800's, both black and white Americans were speaking out against slavery. Some of the most important people in the abolitionist movement were William Lloyd Garrison, Angelina and Sarah Grimke, Frederick Douglass, Sojourner Truth, and Harriet Tubman. Frederick Douglass and Sojourner Truth were both escaped slaves who spoke out against the evils of slavery. Harriet Tubman, also an escaped slave, helped conduct the Underground Railroad to help free slaves. All these people risked their lives to speak out against slavery.