On 14 February, 1956, the Soviet leader, Nikita Khrushchev , convened the 20th Communist Party Congress, the first since Stalin's death three years earlier. On the final day, Khrushchev strode to the podium and claimed his moment in history with a four-hour speech against his predecessor and mentor. Tim Whewell examines why Khrushchev made this bold move and raises the question - is the speech still shaking the Kremlin and Russian politics today? Producer Leonida Krushelnycky