What did the fugitive slave law mean for escaped slaves?

The Fugitive Slave Act of 1793 (1 Stat. 302) was an effort to provide a means to enforce the constitutional clause concerning escaped slaves. The act allowed a slave owner to seize an escaped slave, present the slave before a federal or local judge, and, upon proof of ownership, receive a certificate authorizing the slave to be retaken. It also established a penalty of 500 dollars for obstructing an owner's efforts to retake a slave, or for rescuing, harboring, or concealing a fugitive slave.