Show me that reference in the Controlled Substances Act.
It really shows that you don't know much about Harry Anslinger and that you have never seen the movie - Grass.
The short answer to your question is that Harry Anslinger made those comments before several Senate and Congress hearings.
1935: “Marihuana influenced negroes to look at white people in the eye, step on white men’s shadows, and look at a white woman twice.” —Hearst Newspapers
1937: “Marihuana is the most violent drug in the history of mankind.” —Congressional Testimony, H.J. Anslinger, FBN
1938: “Marihuana is more dangerous than heroin or cocaine.” —Anslinger, Scientific American, May, 1938
1938: “If the hideous monster of Frankenstein came face to face with marihuana, he would drop dead of fright.” —Anslinger, FBN, quoted in Hearst newspaper
1937-50: “Negro entertainers with their jazz and swing music are declared an outgrowth of marihuana use which possesses white women to tap their feet.” —statements to Congress by Anslinger, FBN
I know that he died years before the Controlled Substances Act was written.