Today is Martin Luther King, Jr Day.
MLK is one of the most widely celebrated- and appropriated- figures of the American Civil Rights Movement. He is widely praised for his conviction to nonviolent resistance against white supremacy and poverty, while his opposition to war and criticisms of capitalism go largely unacknowledged by mainstream commentary.
King was a target of heavy FBI surveillance; at one point, the agency sent him a letter ordering him to kill himself. In 1998, a Memphis civil court ruled in a wrongful death suit that the US government had been part of a conspiracy to have him assassinated. A subsequent investigation by the Department of Justice, predictably, concluded that the evidence was not sufficient to suggest a government plot.
Today, you will very likely see politicians and public figures make a point to invoke his name, and to assure you that Dr. King would approve of their policy decisions. The majority of them will be lying or grossly misinformed.
Here is a bibliography of his writings and speeches.