What is the American Civil Liberties Union?

 Background from Wikipedia

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Part of the description: 

The American Civil Liberties Union (ACLU) is a nonprofit organization founded in 1920 "to defend and preserve the individual rights and liberties guaranteed to every person in this country by the Constitution and laws of the United States".Officially nonpartisan, the organization has been supported and criticized by liberal and conservative organizations alike. The ACLU works through litigation and lobbying and it has over 1,200,000 members and an annual budget of over $300 million. Local affiliates of the ACLU are active in all 50 states, the District of Columbia, and Puerto Rico. The ACLU provides legal assistance in cases when it considers civil liberties to be at risk. Legal support from the ACLU can take the form of direct legal representation or preparation of amicus curiae briefs expressing legal arguments when another law firm is already providing representation.

Some history: 

The ACLU was founded in 1920 by a committee including Helen Keller, Roger Baldwin, Crystal Eastman, Walter Nelles, Morris Ernst, Albert DeSilver, Arthur Garfield Hays, Jane Addams, Felix Frankfurter, Elizabeth Gurley Flynn, and Rose Schneiderman. Its focus was on freedom of speech, primarily for anti-war protesters. It was founded in response to the controversial Palmer raids, which saw thousands of radicals arrested in matters which violated their constitutional search and seizures protection. During the 1920s, the ACLU expanded its scope to include protecting the free speech rights of artists and striking workers, and working with the National Association for the Advancement of Colored People (NAACP) to decrease racism and discrimination. During the 1930s, the ACLU started to engage in work combating police misconduct and supporting Native American rights. Many of the ACLU's cases involved the defense of Communist Party members and Jehovah's Witnesses. In 1940, the ACLU leadership voted to exclude communists from its leadership positions, a decision rescinded in 1968. During World War II, the ACLU defended Japanese-American citizens, unsuccessfully trying to prevent their forcible relocation to internment camps. During the Cold War, the ACLU headquarters was dominated by anti-communists, but many local affiliates defended members of the Communist Party.