The main proponents of the abolition movement in the United States included key figures such as Frederick Douglass, Harriet Tubman, Sojourner Truth, and William Lloyd Garrison. Frederick Douglass, a former enslaved person, became a powerful orator and writer advocating for abolition and equal rights. Harriet Tubman was renowned for her role as a conductor on the Underground Railroad, helping enslaved people escape to freedom. Sojourner Truth was a former enslaved woman who fought for both abolition and women's rights. William Lloyd Garrison published "The Liberator," a prominent abolitionist newspaper that called for immediate emancipation and civil rights.