There are two police stations on the New York map (indicated by police badges), one in northeast Manhattan and one in northeast Brooklyn. If you own both at the beginning of your turn, you can order the police to kill one enemy guy. Hey, like you're surprised the cops are bent in Deathground?
 
There are two hospitals on the map (indicated by the physician's symbol), one in central Manhattan, and one in southern New Jersey. If you own both at the beginning of your turn, your skilled doctors bring a small number of your "dead" wiseguys back to fight for you. (The poor saps!)
 
The other maps also have police and hospitals, so be sure to look for them.
