In September 1941, Julius Streicher published an essay in Der Sturmer that called Kaufman's book "the crazy thinking of [an] insane Jewish brain". He quoted Kaufman at length and then commented: "By destroying the German people, the Jew wants to stop up the spring from which, since the beginning, the world has always found its creative blood, the source of all that is beautiful, good and noble."[14] Joseph Goebbels also gave a radio address from Berlin warning Germans of "plans 'for sterilization of our entire population under 60 years' of age".[2] These concerns were echoed by Adolf Hitler himself after the US entered World War II; he claimed mass sterilization of German male youth was a "primary" American goal.[3]