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On August 28, 1963, in front of a crowd of nearly 250,000 people spread across the National Mall in Washington, D.C., the Baptist preacher and civil rights leader Rev. Dr. Martin Luther King, Jr. delivered his now-famous “I Have a Dream” speech from the steps of the Lincoln Memorial.

Organizers of the event, officially known as the March on Washington for Jobs and Freedom, had hoped 100,000 people would attend. In the end, more than twice that number flooded into the nation’s capital for the massive protest march, making it the largest demonstration in U.S. history to that date.

WATCH: The Power of Martin Luther King, Jr.'s 'I Have A Dream' Speech

King’s “I Have a Dream” speech now stands out as one of the 20th century’s most unforgettable moments, but a few facts about it may still surprise you.

1.) There were initially no women included in the event.

Despite the central role that women like Rosa Parks, Ella Baker, Daisy Bates and others played in the civil rights movement, all the speakers at the March on Washington were men. But at the urging of Anna Hedgeman, the only woman on the planning committee, the organizers added a “Tribute to Negro Women Fighters for Freedom” to the program. Bates spoke briefly in the place of Myrlie Evers, widow of the murdered civil rights leader Medgar Evers, and Parks and several others were recognized and asked to take a bow. “We will sit-in and we will kneel-in and we will lie-in if necessary until every Negro in America can vote,” Bates said. “This we pledge to the women of America.”

2.) A white labor leader and a rabbi were among the 10 speakers on stage that day.

King was preceded by nine other speakers, notably including civil rights leaders like A. Philip Randolph and a young John Lewis, the future congressman from Georgia. The most prominent white speaker was Walter Reuther, head of the United Automobile Workers, a powerful labor union. The UAW helped fund the March on Washington, and Reuther would later march alongside King from Selma to Montgomery to protest for Black voting rights. 

Joachim Prinz, the president of the American Jewish Congress, spoke directly before King. “A great people who had created a great civilization had become a nation of silent onlookers,” Prinz said of his experience as a rabbi in Berlin during the horrors perpetrated by Adolf Hitler’s Nazi regime. “America must not become a nation of onlookers. America must not remain silent.”

3.) King almost didn’t deliver what is now the most famous part of the speech.

King had debuted the phrase “I have a dream” in his speeches at least nine months before the March on Washington, and used it several times since then. His advisers discouraged him from using the same theme again, and he had apparently drafted a version of the speech that didn’t include it. But as he spoke that day, the gospel singer Mahalia Jackson prompted him to “Tell them about the dream, Martin.” Abandoning his prepared text, King improvised the rest of his speech, with electrifying results.

4.) The speech makes allusions to the Gettysburg Address, the Emancipation Proclamation, the Declaration of Independence, the U.S. Constitution, Shakespeare and the Bible.

“Five score years ago,” King began, referencing the opening of Abraham Lincoln’s Gettysburg Address as well as the Emancipation Proclamation, which had gone into effect in 1863. After 100 years, King noted, “the Negro is still not free,” and the rights promised in the Declaration of Independence and the Constitution were still denied to Black Americans. The image of “this sweltering summer of the Negro’s legitimate discontent” echoes the opening soliloquy in William Shakespeare’s Richard III (“Now is the winter of our discontent”), while the soaring end of the speech, with its repeated refrains of “Let freedom ring” calls on the 19th-century patriotic song "My Country 'Tis of Thee," written by Samuel Francis Smith. 

Finally, King’s speech repeatedly draws on the Bible, including an allusion to the Book of Psalms (“Weeping may linger for the night, but joy comes with the morning”) and a quote from the Book of Isaiah (“Every valley shall be exalted, and every mountain and hill shall be made low...”), to name just two references.

5.) The speech impressed the Kennedy administration and helped advance civil rights legislation in Congress.

All three major TV networks at the time (ABC, CBS and NBC) aired King’s speech, and though he was already a national figure by that time, it marked the first time many Americans — reportedly including President John F. Kennedy — had heard him deliver an entire speech. Kennedy was assassinated less than three months later, but his successor, Lyndon Johnson, would sign the Civil Rights Act of 1964 and the Voting Rights Act of 1965 into law, marking the most significant advances in civil rights legislation since Reconstruction.

Martin Luther King, Jr., I Have a Dream speech

A badge featuring Martin Luther King, Jr., and the quote from his famous speech 'I Have a Dream', c. 1963. 

6.) At the same time, the success of the speech attracted the attention (and suspicion) of the FBI.

Federal authorities monitored the March on Washington closely, fearing sedition and violence. Policing of the march turned into a military operation, codenamed Operation Steep Hill, with 19,000 troops put on standby in the D.C. suburbs to quell possible rioting (which didn’t happen). After the event, FBI official William Sullivan wrote that King’s “powerful, demagogic speech” meant that “we must mark him now...as the most dangerous Negro of the future in this Nation.” 

At the FBI’s urging, Attorney General Robert Kennedy authorized the installation of wiretaps on King’s phone and those at the offices of his organization, the Southern Christian Leadership Conference (SCLC), ostensibly to look into potential communist ties. The FBI later stepped up its surveillance of King, which lasted until his assassination in 1968.

7.) The King family still owns the 'I Have a Dream' speech.

Though it is one of the most famous and widely celebrated speeches in U.S. history, the “I Have a Dream” speech is not in the public domain, but is protected by copyright—which is owned and enforced by King’s heirs. As reported in the Washington Post, King himself obtained the rights a month after he gave the speech, when he sued two companies selling unauthorized copies. Though some parts of the speech may be used lawfully without approval (for example, individual teachers have been able to use the speech in their classrooms), the King estate requires anyone who wants to air the speech to pay for that right. 

READ MORE: 10 Things You May Not Know About Martin Luther King, Jr.

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