It was one of the most spectacular trials at the end of the Weimar Republic: The indictment against art dealer Otto Wacker for having sold 33 fake van Gogh paintings. The case came to light during the major van Gogh exhibition held in the spring of 1928 at Paul Cassirer in Berlin. Wacker, the new star in the Berlin art market, had promised several loans; when they arrived, it became clear to Grete Ring and Walter Feilchenfeldt that they could only be forgeries. However, it took a full four years for the trial to take place: The potential damage to the image of those who had collaborated with Wacker seemed too great. Prominent experts like Julius Meier-Graefe and Jacob Baart de la Faille, the author of the recently published catalog raisonné, had confirmed the authenticity of Wacker's van Goghs in their reports. With the exception of Cassirer, all notable experts had doubts.