Compromise of 1850 include the Fugitive Slave Act that was passed by congress and the act was between southern slaves interest and northern free slaves.
According to this act, all the free slaves or other slaves were asked to return to their owners.
Other actions under Compromise of 1850 are abolishment of slave trade in Washington, D.C and California became the Union as a free state.
Hence, the correct answer is "Congress would pass the Fugitive Slave Act."
