# Wickedness is in the middle of it

"People do wicked things in the middle of the city" or "people destroy things in the city" 

# oppression and deceit do not leave its streets

"People oppress and deceive others in the city streets, and they do not leave" or "People are always oppressing and deceiving others in the city streets" 

# its streets

This may refer to the marketplaces in the city.