Sentence:  Only a strong countermovement could prevent the triumph of <WSD>Semitism</WSD> all over the world. The urgent task for Germans was to overcome the <WSD>Semitism</WSD> within themselves, and racial hygiene was the means to this end. 
Meaning of the word marked with <WSD> tags:  Judaism; Jewishness (especially when seen as the thing to which "anti-Semitism" is opposed).