King, representing SCLC, was among the leaders of the so-called "Big Six" civil rights organizations who were instrumental in the organization of the March on Washington for Jobs and Freedom, which took place on August 28, 1963. The other leaders and organizations comprising the Big Six were: Roy Wilkins from the National Association for the Advancement of Colored People; Whitney Young, National Urban League; A. Philip Randolph, Brotherhood of Sleeping Car Porters; John Lewis, SNCC; and James L. Farmer, Jr. of the Congress of Racial Equality. The primary logistical and strategic organizer was King's colleague Bayard Rustin. For King, this role was another which courted controversy, since he was one of the key figures who acceded to the wishes of President John F. Kennedy in changing the focus of the march. Kennedy initially opposed the march outright, because he was concerned it would negatively impact the drive for passage of civil rights legislation, but the organizers were firm that the march would proceed.
The march originally was conceived as an event to dramatize the desperate condition of blacks in the southern United States and a very public opportunity to place organizers' concerns and grievances squarely before the seat of power in the nation's capital. Organizers intended to denounce and then challenge the federal government for its failure to safeguard the civil rights and physical safety of civil rights workers and blacks, generally, in the South. However, the group acquiesced to presidential pressure and influence, and the event ultimately took on a far less strident tone.As a result, some civil rights activists felt it presented an inaccurate, sanitized pageant of racial harmony; Malcolm X called it the "Farce on Washington," and the Nation of Islam forbid its members from attending the march.
The march did, however, make specific demands: an end to racial segregation in public schools; meaningful civil rights legislation, including a law prohibiting racial discrimination in employment; protection of civil rights workers from police brutality; a $2 minimum wage for all workers; and self-government for Washington, D.C., then governed by congressional committee. Despite tensions, the march was a resounding success. More than a quarter million people of diverse ethnicities attended the event, sprawling from the steps of the Lincoln Memorial onto the National Mall and around the reflecting pool. At the time, it was the largest gathering of protesters in Washington's history. King's "I Have a Dream" speech electrified the crowd. It is regarded, along with Abraham Lincoln's Gettysburg Address and Franklin D. Roosevelt's Infamy Speech, as one of the finest speeches in the history of American oratory.
The March, and especially King's speech, helped put civil rights at the very top the liberal political agenda in the United States and facilitated passage of the Civil Rights Act of 1964.
On March 29, 1968, King went to Memphis, Tennessee, in support of the black sanitary public works employees, represented by AFSCME Local 1733, who had been on strike since March 12 for higher wages and better treatment. In one incident, black street repairmen received pay for two hours when they were sent home because of bad weather, but white employees were paid for the full day.On April 3, King addressed a rally and delivered his "I've Been to the Mountaintop" address at Mason Temple, the world headquarters of the Church of God in Christ. King's flight to Memphis had been delayed by a bomb threat against his plane. In the close of the last speech of his career, in reference to the bomb threat, King said the following:And then I got to Memphis. And some began to say the threats, or talk about the threats that were out. What would happen to me from some of our sick white brothers? Well, I don't know what will happen now. We've got some difficult days ahead. But it doesn't matter with me now. Because I've been to the mountaintop. And I don't mind. Like anybody, I would like to live a long life. Longevity has its place. But I'm not concerned about that now. I just want to do God's will. And He's allowed me to go up to the mountain. And I've looked over. And I've seen the promised land. I may not get there with you. But I want you to know tonight, that we, as a people, will get to the promised land. And I'm happy, tonight. I'm not worried about anything. I'm not fearing any man. Mine eyes have seen the glory of the coming of the Lord.