Why was the new Fugitive Slave Act controversial, in many cases causing outrage?

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The new Fugitive Slave Act of 1850 was controversial because it offered a strong temptation to kidnap free blacks in northern free states. This law allowed slave catchers to seize runaway slaves and return them to their owners, even if they were in a free state. This created a lot of outrage among abolitionists and people who were sympathetic to the plight of slaves, as it violated basic principles of freedom and human rights. Additionally, it led to a number of kidnappings of free blacks, who were then falsely claimed as fugitive slaves and sold into slavery in the South.

Why Was the New Fugitive Slave Act Controversial, in Many