 The Polenaktion began on October 27, 1938, as the Nazis began arresting Jews of Polish nationality in Germany with the intention of expelling them to Poland.The Nazis took this decision was the issuing of a decree by the Polish Ministry of the Interior on the 6 October 1938 which called for the passports of Polish citizens residing abroad would have to be checked and revalidated.A few days before that decree was to come into force, 17,000 German Jews that were or could be considered to be citizens of Poland were rounded up and unceremoniously dumped on the Polish border at Zbąszyń and other border towns.