How did the African-Americans escape detection on the Underground Railroad?
The Underground Railroad helped slaves escape from the South prior to the Civil War into the North and Canada.
I am just wondering how they were able to do that, especially since racism was rampant back then, and a group of traveling African-Americans in the South would be suspected to be escaped slaves. (Especially after Dred Scott. There were actually bounty hunters going after escaped slaves.)
How did the African-Americans who escaped slavery manage to escape detection on the Underground Railroad?
P.S. I read the wiki article already, but it covered mostly the history and procedures on the Underground Railroad, not so much what the actual experience was like.
This question is in the General Section. Responses must be helpful and on-topic.