How did the Personal Liberty Law in the US increase tensions between the North and South over the Fugitives Slave Act?

The Personal Liberty Laws were state laws passed in Northern states in response to the Fugitive Slave Act. These laws aimed to protect the rights of free blacks and fugitive slaves from being captured and returned to the South. By undermining the enforcement of the Fugitive Slave Act, the Personal Liberty Laws exacerbated tensions between the North and South by challenging federal authority and the institution of slavery.