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This Friday is the anniversary of the 1963 March on Washington, at which the civil rights leader Dr Martin Luther King made his famous 'I Have A Dream' speech. Sweeping civil rights legislation was passed in America soon afterwards - but a key provision of the law which banned racial discrimination in voting is no longer in effect, struck down by the Supreme Court. Now there are accusations by voting rights advocates that southern states have reintroduced laws which have the effect of suppressing black voters. Laura Trevelyan reports. Produced by Tristan Cimini.