In July and October 1940, the Germans imprisoned nearly 350 people to put pressure on the Dutch authorities in the Dutch East Indies to treat the Germans well who had been captured there.
These so-called Indische gijzelaars [“East Indian hostages”] were first brought to the German concentration camp of Buchenwald. From there, they were transferred to the Major Seminary in Haaren, a town in the Dutch province of North Brabant, in November 1941. The building was also turned into a prison over the course of 1942 for active opponents of the Nazi regime. It was often members of the resistance who were arrested by the Sicherheitsdienst and Sicherheitspolizei. Their cases were investigated, and they were incarcerated in SD prisons like the one in Haaren for as long as the investigation lasted. After being tried, they were frequently transferred to prisons in Germany.
Source: Nederland en de Tweede Wereldoorlog ["The Netherlands and WWII"], comp. René Kok and Erik Somers, NIOD; Uitgeverij Waanders, 2005