 Complete the following phrase:  The border to Czechoslovakia was opened again on 1 November, and the Czechoslovak authorities soon let all East Germans travel directly to West Germany without further bureaucratic ado, thus lifting their part of the Iron Curtain on 3 November. On 4 November the authorities decided to authorize a demonstration in Berlin and were faced with the Alexanderplatz demonstration, where half a million citizens converged on the capital demanding freedom in the biggest protest the GDR ever witnessed. Unable to stem the ensuing flow of refugees to the West through Czechoslovakia, the East German authorities eventually caved in to public pressure by allowing East German citizens to enter West Berlin and West Germany directly, via existing border points, on 9 November 1989, without having properly briefed the border guards. Triggered by the erratic words of regime spokesman Günter Schabowski in a TV press conference, stating that the planned changes were in effect immediately, without delay, hundreds of thousands of people took advantage of the opportunity. The guards were quickly overwhelmed by the growing crowds of people demanding to be let out into West Berlin. After receiving no feedback from their superiors, the guards, unwilling to use force, relented and 