During the last year of the war, Sweden began to play a role in humanitarian efforts, and many refugees, among them several thousand Jews from Nazi-occupied Europe, were rescued thanks to the Swedish rescue missions to internment camps and partly because Sweden served as a haven for refugees, primarily from the Nordic countries and the Baltic states. The Swedish diplomat Raoul Wallenberg and his colleagues ensured the safety of tens of thousands of Hungarian Jews. Nevertheless, both Swedes and others have argued that Sweden could have done more to oppose the Nazis' war efforts, even if it meant increasing the risk of occupation.