ACLU

Another sore point for my conservative friends is the American Civil Liberties Union for some reason. Ladies and Gentlemen thier sole purpose is to defend the rights of United States citizens and it doesn't matter if it's current client Rush Limbaugh(dispite the fact he does nothing but bash them) or anyone of any party. I would like one logical reason from any conservative friend why this is so? Why would they spill such venom for a group that protects people?? Please someone let me know