An example is police officers accepting bribes in exchange for not reporting organized drug or prostitution rings or other illegal activities. Another example is police officers ignoring the police code of conduct in order to be fully able to catch suspects (for example using forged evidence). Another, very rare, example would be police and other government entities deliberately and systematically participating in organized crime themselves.
In most major cities there are internal affairs sections to investigate suspected police corruption or misconduct. Similar entities include the British Independent Police Complaints Commission.
