(NBC News) He was attacked by police dogs and locked in jail, and, in 1969, he was assassinated.
But, today, Dr. Martin Luther King's life and principles were honored on the federal holiday devoted to the slain civil rights leader.
From parades to church tributes to youth-led service projects thousands across the country used the federal holiday to remember King.
President Obama and first lady Michelle Obama took part in a community service event in the Washington, D.C. area, while Vice President Joe Biden, spoke at a breakfast hosted by Reverand Al Sharpton's National Action Network in Washington.
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