May Day protest starting in Union Square and ending on the financial district in downtown Manhattan.

Shreveport's Mariam Harley urges African-American shoppers to show their economic power by boycotting the Black Friday shopping weekend. 'We would like to see changes in the laws...I'm hoping that everyone joins in and not shop and...

Shreveport's Mariam Harley urges African-American shoppers to show their economic power by boycotting the Black Friday shopping weekend. 'This is a human issue...'

Shreveport's Mariam Harley urges African-American shoppers to show their economic power by boycotting the Black Friday shopping weekend. 'This is the most profitable time of the year...it's about economic power, economic freedom...we do...

Shreveport's Mariam Harley urges African-American shoppers to show their economic power by boycotting the Black Friday shopping weekend.'Yes this is solidarity...If you don't purchase anything then they will see that we are...

View of Washington Monument and crowds at the March on Washington as they listen to MLK's speech.

Crowds gather to listen to MLK give his 'I Have a Dream' speech.

Martin Luther King making his I Have a Dream speech during the Civil Rights March on Washington / audio: 'I have a dream that one day this nation will rise up and live out the true meaning of its creed - We hold these truths to be...

Civil Rights leader, Martin Luther King leads peace march procession to the United Nations to urge UN pressure to force the US to stop bombing North Vietnam / crowds outside watching. MLK at Vietnam War peace march on April 15, 1967 in...

Placard about draft card burning / men trying to burn draft cards / counter-demonstrators, one wearing US Army jacket, shouting at man / Placard, 'END HANOI SANCTUARY - Let's Bomb Hanoi To Win The War and Destroy the Communist...

50,000 march down Market Street to Kezar Stadium for mass peace demonstration assembly / pro and anti-Vietnam War protesters clash and shove each other. Anti-Vietnam war peace march in San Francisco on April 15, 1967 in San Francisco,...

Protesters marching with placards, 'They Are Our Brothers Whom We Kill', 'Black Men Should Fight White Racism, Not Vietnamese Freedom Fighters' / CU feet walking / demonstrators gather in Central Park wearing make-up and...

/ people holding placards, singing, chanting, and carrying banners. Demonstrators at the March on Washington on August 28, 1963 in Washington, DC (Footage by Getty Images)

/ People arriving at march, Odetta singing 'I'm on my Way' / crowds and people holding signs. Odetta performing at the March on Washington on August 28, 1963 in Washington, DC (Footage by Getty Images)

/ young women and men singing 'Keep your Eyes on the Prize' the night before the March on Washington. Women and men singing the night before the March on Washington on August 27, 1963 in Washington, DC (Footage by Getty Images)

/ marshal clearing street for front line of march to pass through / A Philip Randolph marching. March on Washington begins on August 28, 1963 in Washington, DC (Footage by Getty Images)

Attendees of the Civil Rights March on Washington leave on a bus / tired attendees sleeping on bus as they go home after the march. August 28, 1963 in Washington, DC

Civil rights march, which became riot resulting in death of 14 catholic people / Hundreds of marchers gathered carrying banners, large 'Civil Rights Association' banner / People in lines past to main demonstration through residential...

Senator Robert Kennedy supports support to striking farm works / RFK makes statement supporting workers, Cesar Chavez sits by his side (footage by Encyclopaedia Britannica Films). RFK supports UFW strike, Chavez by his side on January...

/ Marian Anderson introduced and sings 'He's Got the Whole World in his Hands' / A Philip Randolph shaking her hand before she sings / crowd listening. Marian Anderson performs at the March on Washington on August 28, 1963 in Washington,...