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Dexter Scott King, second left, Martin Luther King III, back second right, and Bernice King, right, are joined by their family as they lay a wreath on the grave of their parents' crypt outside of the King Center in Atlanta, Wednesday, April 4, 2018. With thoughts on the past and eyes to the future, thousands marched and sang civil rights songs Wednesday to honor the Rev. Martin Luther King Jr., the "apostle of nonviolence" silenced by an assassin 50 years ago. (Alyssa Pointer/Atlanta Journal-Constitution via AP), APTOPIX