The National Socialist German Workers Party gained strength in Germany after the First World War. In 1919, a political theorist of this movement, Dietrich Eckart, attacked Steiner and suggested that he was a Jew. In 1921, Adolf Hitler attacked Steiner on many fronts, including accusations that he was a tool of the Jews, while other nationalist extremists in Germany called for a "war against Steiner". That same year, Steiner warned against the disastrous effects it would have for Central Europe if the National Socialists came to power. In 1922 a lecture Steiner was giving in Munich was disrupted when stink bombs were let off and the lights switched out, while people rushed the stage apparently attempting to attack Steiner, who exited safely through a back door. Unable to guarantee his safety, Steiner's agents cancelled his next lecture tour. The 1923 Beer Hall Putsch in Munich led Steiner to give up his residence in Berlin, saying that if those responsible for the attempted coup and others came to power in Germany, it would no longer be possible for him to enter the country.