Final answer:
Turning an escaped slave over to slavecatchers would be an act of perfidy for someone working for the Underground Railroad.
Step-by-step explanation:
To someone working for the Underground Railroad, turning an escaped slave over to slavecatchers would be an act of perfidy. The Underground Railroad was a network of people who helped enslaved individuals escape to freedom. Their goal was to defy the Fugitive Slave Act and provide safety and assistance to runaway slaves.