People who speak out against slavery are called abolitionists. For 50 years, they have been working to eliminate slavery. They form a secret network of farms and families who hide and help runaways escape from the South to freedom. This is called the Underground Railroad, even though there are no actual trains or tracks. As hundreds of slaves vanish, their owners become outraged. The federal government enacts laws, called compromises that try to find solutions. But only after a bloody war is fought will the issue of slavery be resolved.