The underground railroad was a secret system that was run by
enslaved workers in fields and in cities.
plantation owners and overseers in the south.
maroon communities" living in the wilderness.
free african americans and abolitionists in the north.

Enslaved workers in fields and in cities

Explanation:

Enslaved workers in fields and in cities.

Explanation:

The Underground Railroad was a network of escape routes that were used by slaves from the South to escape slavery. They started to operate around the 18th century during the Civil War. Many abolitionists helped slaves to use those routes, such as Quaker abolitionists. A group called Vigilance Committees was formed to protect the slaves that escaped from bounty hunters on the Northern States.