West Germany closed its still-open inner-German border to stop youth travel eastward

Evidence

To stop people going to the `Third Youth and Student World Peace Festival’ held in East Berlin on 5-9 August 1951, The German-German border, which at that time was still open, was closed by substantial numbers of West German police. — Rolf Wiggershaus, The Frankfurt School, 1895

Categorization

• QUESTION: The phrasing appears truncated or garbled here (‘The German-German border’ repeated); worth checking the original German text for the correct account of this border closure.