The city and seaport were occupied in September 1939 by German troops and renamed "Gotenhafen" after the Goths, an ancient Germanic tribe, who had lived in the area. Some 50,000 Polish citizens, who after 1920 had been brought into the area by the Polish government after the decision to enlarge the harbour was made, were expelled to the General Government. Kashubians who were suspected to support the Polish cause, particularly those with higher education, were arrested and executed. The main place of execution was Piaśnica (Groß Plaßnitz), where about 12,000 were executed. The German gauleiter Albert Forster considered Kashubians of "low value" and did not support any attempts to create a Kashubian nationality. Some Kashubians organized anti-Nazi resistance groups, "Gryf Kaszubski" (later "Gryf Pomorski"), and the exiled "Zwiazek Pomorski" in Great Britain.