Troy is right, calling the Police Dept. gives you a direct resource for checking on crime. A website some of my buyer's have used is http://spotcrime.com/wi/milwaukee.
This site shows crime by specific areas.
Many neighborhoods have neighborhood watch committee. Check in with the police department, they can give you further details. Usually there are signs up in the neighborhoods also.
If you'd like any information on what homes are available please feel free to contact me or check my website for available properties.
Good luck in your home search!