The American Civil Liberties Union:

A socially liberal group of NYC lawyers that will, through the U.S. Legal System, viciously defend the rights they say are protected by the U.S. Constitution, whether or not culturally moral.

Though not always, the ACLU mostly sues parties potentially responsible for situations that are currently popular in the media and that adversely affect the "victim" of the issue.
11/9/10 Reuters Headline:

ACLU sues to stop Defense of Marriage Act
by Theo Thoughts December 8, 2010
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A group dedicated to preserving everyone's liberties- they even helped defend Urban Dictionary from censorship.
Thanks for helpine UD ACLU!
by ekuleloc April 1, 2007
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group of "people" who have done more do destroy liberty in the United States than any other single group in its history.
aclu :"you have the right to murder,steal,destroy property, and disgrace that which is good. but the moment you call the those who killed 3000 people terrorists we destroy all that is dear to you"
by Young calgar November 22, 2006
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An organization that has socialist roots, not to mention it was originally an anti-war movement in the 1920's. Lately they have been leading the Pro-Choice front(oh look a condom!) and the war against Christmas.

Generally the standard ACLU infantryperson(note political correctness) is equiped with a Membership card, and a big book of law suits which have been filed in the past. The ACLU takes small cases that have been won in small towns(because small organizations and local schools can't fund defense against huge amounts of cash) and projects them onto larger cities and areas, eventually certain thing's are banned on a state wide basis. Not to mention a suitcase filled with cash, please note that many people unsuspectingly donate to the ACLU(including progressive auto insurance coughboycottcough).

The ACLU also uses the media to gain proponents, they are hailed as a good and rightous organization but really deep down they're stripping our liberties away. They may make a few cases that are truly good, but those generally are just a cover up for what really is going on.
Oh snap, ACLU attornies really are socialists!
by "Hey be tolerant!" February 16, 2006
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the self proclaimed gaurdians, defenders and founders of equal rights and tolerance who spend most of their discriminating against and taking rights away from groups they don't like (christians)
the aclu are like the ancient romans: they'll only give you rights if you first renounce jesus christ and pledge to worship them
by joey detone, chicago May 30, 2009
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Misguided fools that don't understand what the American Civil Liberties Union is all about. The aclu defends people and organizations that face threats to their Constitutional Rights. The Constitution is meant to protect Americans from the powerful government, corporations and/or individuals. Remember everyone is created equal? The aclu takes on cases to defend people's civil rights, particularly those in the 1st Ammendment: freedom of the press, religion, speech and assembly.
ACLU bashers are usually just misinformed fuckwits, however some neocons actually are opposed to the idea of a group defending the rights of the little guy.
by Charles_U_Farley June 14, 2010
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