The Hip-hop Police and the bias behind it

A couple days ago I watched a documentary which was about the NYPD and their special investigations with high profile rappers.  The NYPD is known for keeping close eyes on many hip-hop and rap artists in New York and have documents on each rapper and also where you can find them, their home address, and also places in which they hang out.  The reason for the police doing this is because they believe that with high-profile rappers and usually other African american artist always are associated with crime in their lifestyle.  Personally I believe that this stereotypical and bias viewpoint is wrong and is basically putting a label on all rappers good or bad.  In the documentary they talk about a rap group called "Screwball" who wrote a song called "who shot rudy?" which talks about the attempted assassination of mayor Giuliani.  After hearing this song Rudy Giuliani was clearly upset and ordered the police to detain all the members of Screwball and go through an intense search of their belongings and their background.  Currently the only city with a "hip-hop police" as many rappers call them is New York but only time can tell if these hip-hop police will start popping up in other cities where rap is a large influence.  Personally I believe that bias and stereotyping go hand to hand.  For someone to be bias towards something they must have a pre-conceived notion about the topic and I feel like some people make their decisions on things they believe before hearing both sides of the story.