When was the fugitive slave act passed, and what were the consequences of this law?

When was the fugitive slave act passed?
The Fugitive Slave Act was passed by the U.S. Congress on September 18, 1850.
What was the consequences of this law?
It required that all runaway slaves to be returned to their masters, and it made it a crime for people to help runaway slaves. 

The second , larger puritan colony of massachusetts bay was conceived as a "city upon a hill". but it also struggled with internal turmoil like the salem witch trials and external conflicts like king philip's (metacom's) war.