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What advertisement led to the lawsuit in New York Times Co. v. Sullivan?

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The lawsuit in New York Times Co. v. Sullivan was triggered by a full-page advertisement titled "Heed Their Rising Voices," which was published in The New York Times on March 29, 1960.12

The advertisement was created by a group of civil rights activists to condemn the violence faced by students during the civil rights movement in Montgomery, Alabama, and to raise funds for the cause. Although the advertisement did not name Montgomery police commissioner L.B. Sullivan, he sued the newspaper for libel, arguing that the text implied his police force was complicit in acts of terrorism and brutality against African Americans. The advertisement contained several minor factual inaccuracies, which served as the basis for the initial libel claim under Alabama law.12