The NSDAP, whose members were known as "Nazis", had risen from being a fringe group to the second-largest party in the Reichstag. Led by Hitler, who exercised sole control over its policy and direction, its ideology combined extreme hostility towards the Weimar Republic with fervent antisemitism and German nationalism. The threat of Hitler caused many on the left to support Hindenburg; at the same time, Hindenburg's failure to overturn the Weimar Republic had disappointed many of them who had supported him in 1925.