The National Archives has a pdf of the famous MLK speech.
Read it today. Here is an excerpt, wherein King speaks to the many who protested knowing that powerful people would do them harm.
I am not unmindful that some of you have come out of great trials and tribulations. Some of you have come fresh from narrow jail cells. Some of you have come from areas where your quest for freedom left you battered by the storms of persecution and staggered by the winds of police brutality. You have been the veterans of creative suffering.
Further historical documents can be found at Slate. They are the flyers for protests that King was leading when he was assassinated. The struggle continues. What are we doing today, to make right what is wrong?
I want to call attention to HamdenRice’s must-read post “Most of you have no idea what Martin Luther King actually did”
What most people who reference Dr. King seem not to know is how Dr. King actually changed the subjective experience of life in the United States for African Americans. And yeah, I said for African Americans, not for Americans, because his main impact was his effect on the lives of African Americans, not on Americans in general. His main impact was not to make white people nicer or fairer. That’s why some of us who are African Americans get a bit possessive about his legacy. Dr. Martin Luther King’s legacy, despite what our civil religion tells us, is not color blind.