Sentence:  In other words , the promulgators of the murder plan made clear that physically exterminating the Jews was but an extension of the anti-Semitic measures already operating in every phase of German life , and that the new conspiracy counted on the general anti-Semitism that had made those measures <WSD>effective</WSD> , as a readiness for murder . 
Meaning of the word marked with <WSD> tags:  producing or capable of producing an intended result or having a striking effect