In April 1941, Richter was sent to Bucharest, Romania, as the adviser on Jewish affairs. He collaborated closely with the German Ambassador to Romania, Manfred Freiherr von Killinger. After visiting Berlin in September 1941, Richter returned to Romania, where he was until August 1944. It was Richter who insisted on the reintroduction of repressive measures. On 3 September 1941, it was by his order that wearing the yellow badge was re-endorsed. Richter's primary task was to take a census of all the Jews in Romania. He planned the ghettoization and ultimate extermination of 300,000 Romanian Jews, after their deportation to the Belzec extermination camp in occupied Poland. His other task was to prevent even the emigration of Jewish children from Romania to British mandate Palestine.