Most Americans today know that Reverand Martin Luther King Jr. was killed in 1968 in Memphis, Tennessee, but fewer know why he was there.

King went to Memphis to support African American garbage workers, who were on strike to protest unsafe conditions, abusive white supervisors, and low wages — and to gain recognition for their union. Their picket signs relayed a simple but profound message: “I Am A Man.”

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Today we view King as something of a saint, his birthday a national holiday, and his name adorning schools and street signs. But in his day, the establishment considered King a dangerous troublemaker. He was harassed by the FBI and vilified in the media. He began his activism in Montgomery, Alabama, as a crusader against the nation’s racial caste system, but the struggle for civil rights radicalized him into a fighter for broader economic and social justice. He recognized the limits of breaking down legal segregation. What good was winning the right to eat at a dime-store lunch counter if you couldn’t afford a hamburger and a Coke?

Full Story: American Prospect.

Meanwhile, 19% of college students don’t know what the “I Have a Dream” speech was about.