Harriet Tubman helped free over 300 slaves as a conductor on the Underground Railroad and was nicknamed "Moses". Sojourner Truth gained national recognition for her anti-slavery speeches as the first African-American woman to do so and later counseled freedmen in Washington D.C. Harriet Beecher Stowe wrote the influential novel Uncle Tom's Cabin after visiting a plantation, revealing the evils of slavery to widespread acclaim. Fredrick Douglass was an ex-slave who wrote an acclaimed autobiography and published the antislavery newspaper The North Star, becoming a leading abolitionist spokesperson.