"i am talking about free speech and if someone has the right to say they hate police and that it is okay to kill police then it is alright for a crazy group like the KKK to voice their opinions."
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Absolutely correct.. To add to this, the line is drawn at things like; "Inciting imminent lawless action" or "Fighting words". (Taken from Wikipedia)
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When they are chanting their rhetoric like "blacks must go" however ridiculous it is, it IS protected. However, the very second they look at an individual or group and address them directly with that garbage, they have exceeded their freedoms. Which BTW could open a doorway for legal recourse... just sayin'