What part of the Fugitive Slave Act particularly angered Northerners? If they did not enforce the act, they were subject to jail
time or a fine. They were forced to accept the practice of slavery in the North. Free African Americans in the North were automatically sold into slavery.
The part that particularly angered Northerners was that if they did not enforce the act, they were subject to jail time or a fine. Even if Northerners opposed slavery, they could still be neutral in terms of what they do to help slaves or not. The Fugitive Slave Act forced them to go against their own beliefs with this potential jail time or fine, which really angered them.
