In 1933, Ernst Rüdin, Alfred Ploetz, and several other experts on racial hygiene were brought together to form the Expert Committee on Questions of Population and Racial Policy under Reich Interior Minister Wilhelm Frick. The committee's ideas were used as a scientific basis to justify the racial policy of Nazi Germany and its "Law for the Prevention of Hereditarily Diseased Offspring" was passed by the German government on January 1, 1934. Rüdin was such an avid proponent that colleagues nicknamed him the "Reichsfuhrer for Sterilization"