What did slave catchers use to capture slaves in the underground railroad?

Slave catchers often employed various tactics to capture individuals escaping through the Underground Railroad. They used tracking dogs to follow scents, relied on informants within communities, and utilized legal documents like warrants to justify their actions. Additionally, they sometimes resorted to violence, intimidation, and deception to apprehend runaway slaves. The fear of these tactics contributed to the perilous nature of escape via the Underground Railroad.