His dramatic aims were utilitarian — to influence voters or clarify left-wing policies. He used mechanized sets, lectures, movies, and mechanical devices that appealed to his audiences. In 1926, his updated production of Friedrich Schiller's "The Robbers" at the distinguished Preußisches Staatstheater in Berlin provoked widespread controversy. Piscator made extensive cuts to the text and reinterpreted the play as a vehicle for his political beliefs. He presented the protagonist Karl Moor as a substantially self-absorbed insurgent. As Moor's foil, Piscator made the character of Spiegelberg, often presented as a sinister figure, the voice of the working-class revolution. Spiegelberg appeared as a Trotskyist intellectual, slightly reminiscent of Charlie Chaplin with his cane and bowler hat. As he died, the audience heard "The Internationale" sung.