Final answer:
The Abolitionists were the group most enraged by the Fugitive Slave Act.
Explanation:
The group most enraged by the Fugitive Slave Act were the Abolitionists.
The Fugitive Slave Act fueled antislavery resistance in the North, with nine northern states passing laws stating they would not comply with it.
Historians estimate that as a result of the Fugitive Slave Act, thousands of free blacks fled to Canada to escape capture and enslavement.
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