 Complete the following phrase:  From gaining power in January 1933 until the outbreak of war in September 1939, the Nazi persecution of the Jews in Germany was focused on intimidation, expropriating their money and property, and encouraging them to emigrate. According to the Nazi Party policy statement, Jews and Gypsies were the only alien people in Europe. In 1936, the Bureau of Romani Affairs in Munich was taken over by Interpol and renamed the Center for Combating the Gypsy Menace. Introduced at the end of 1937, the final solution of the Gypsy Question entailed round-ups, expulsions, and incarceration of Romani in concentration camps built at, until this point, Dachau, Buchenwald, Flossenbürg, Mauthausen, Natzweiler, Ravensbruck, Taucha and Westerbork. After the 