Socialism

In Ballots, Blood and Bullets, Karl Muller described Nazi policies as "a windy mixture of nationalism, socialism and, above all, anti-Semitism". (PROSE: Timewyrm: Exodus)

When Zoe Heriot suggested that there would be fewer wars if women ran the world, Jennifer Buckingham asked if she was "one of those new socialists." According to Jennifer, socialists "believe[d] in a lot of nonsense." (PROSE: Doctor Who and the War Games)

Behind the scenes
In the real world, the Nazis were not socialists, though the party name did include the word. Indeed, socialists were regarded as enemies of the state by Hitler.