Ramsey Clark, who championed civil rights and liberties as attorney general in the Johnson administration, then devoted much of the rest of his life to defending unpopular causes and infamous people, including Saddam Hussein and others accused of war crimes, died on Friday at his home in Manhattan. He was 93.

His niece Sharon Welch announced the death.

In becoming the nation’s top law enforcement official, Mr. Clark was part of an extraordinary father-and-son trade-off in the federal halls of power. His appointment prompted his father, Justice Tom C. Clark, to resign from the United States Supreme Court to avoid the appearance of any conflict of interest involving cases in which the federal government might come before that bench.

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