Witness: Black History Collection

In 1975, Lee Elder braved death threats to become the first African-American golfer to play at the prestigious US Masters in Augusta.It was one of the last colour barriers in US sport and made him a hero to many black sportsmen - including Tiger Woods.Lee Elder recalls the tournament for Witness.PHOTO: Lee Elder playing golf later in life (Getty Images)

*** Contains descriptions that some listeners may find upsetting *** Enslaved Africans are forced to work in sugar cane fields - the hours are long and there are frequent, brutal punishments. They have endured these conditions for 200 years. By 1831 the anti-slavery movement is gathering pace and the slaves decide to take action - by going on strike. Samuel Sharpe became a Jamaican national hero as he led the island's slaves in a rebellion against the overseers and sugar plantation owners.The rebellion was brutally crushed, but over time, the rebellion had a significant impact - and two years later in 1833 the Slavery Abolition Act is passed. Picture: Making sugar in Jamaica, Credit: HultonArchive/Illustrated London News/Getty Images

In 1948 nearly 500 pioneers travelled from the Caribbean on the Empire Windrush. The passage cost £28, 10 shillings. Passenger Sam King describes the conditions on board and the concerns people had about finding a job in England - and what life was like in their adopted country once they arrived.

In September 1971 prisoners in a high security jail in the US rose up against their guards taking 42 people hostage. After 4 days of negotiations, armed police retook the jail. By the time the siege ended 39 people were dead.Photo: Discussions inside the prison on 10th September 1971. Associated Press.

On August 28th 1963, the American civil rights leader, Martin Luther King, made his historic plea for an end to racial discrimination in the USA. Standing on the steps of the Lincoln Memorial, he addressed hundreds of thousands of activists who had marched to Washington to demonstrate for black rights. Listen to John Lewis, the youngest speaker on the podium that day.Photo: Associated Press.

In 1967, the world heavyweight champion, Muhammad Ali, refused to be indicted into the American military. His decision to follow his conscience and not serve in Vietnam galvanised radicals across the US.Simon Watts speaks to Dr Nathan Hare about a visit by Muhammad Ali to Howard University at the height of the outcry over his refusal of the draft.(Photo: Muhammad Ali in training. Credit: R McPhedran/Express/Getty Images)

The soul singer's April 1968 concert was held amid rioting and violence provoked by the assassination of Martin Luther King. But despite the fears of the city authorities, the streets of Boston were quiet the night James Brown and his band played. Listen to two people who were there.(Photo: James Brown. Credit: AFP)

For nearly 40 years, the US government conducted an experiment on a group of African-American men without their knowledge - to see what would happen if their syphilis was left untreated. Photo: US National Archive.