This 1984 hit by U2 is a tribute to Martin Luther King, Jr. and those throughout history who have died because they preached of the equality of all men and practiced nonviolence as the only way to achieve their goal of having this equality universally recognized.
For a song about history songwriter Bono loses a grade for getting the facts not completely correct.
Martin Luther King Jr was killed on a Memphis motel balcony on April 4, 1968. Bono sings “early morning, April 4,” but King was actually killed in the evening. Bono has acknowledged the mistake and sometimes sings it as “early evening, April 4.”