The Freedom Riders were civil rights activists who rode on buses, testing out whether bus stations were complying with the Supreme Court ruling that banned segregation. Listen to Bernard Lafayette Junior, an eyewitness to how Martin Luther King managed to prevent inter-ethnic bloodshed on a night of extreme tension during the battle against segregation in the American South. Picture: A group of Black Americans get off the 'Freedom Bus' at Jackson, Mississippi, Credit: William Lovelace/Express/Getty Images