Harriet Tubman played a crucial role as a conductor on the Underground Railroad, while Harriet Beecher Stowe authored a significant book addressing the issue of slavery. Abraham Lincoln famously remarked that she was the "little woman who wrote the book that started this great war."
Both Harriet Jacobs and Harriet Robinson experienced unfair treatment. However, unlike Harriet Jacobs, Harriet Robinson had the option to leave her job. (This is a sample response.)