Since 1969 the Castle has served as a conference site and meeting place for the International Police Association.
The collection is owned by the Department of the Groningen International Police Association.
Association football | association football | Forward (association football) | ATP International Series | Goalkeeper (association football) | Defender (association football) | National Basketball Association | International Monetary Fund | American Association for the Advancement of Science | International Red Cross and Red Crescent Movement | ATP International Series Gold | International Space Station | Association of Tennis Professionals | Amnesty International | American Library Association | International Olympic Committee | World Boxing Association | National Collegiate Athletic Association | BirdLife International | American Association | International Finance Corporation | American Heart Association | International Organization for Standardization | International Telecommunication Union | International Criminal Court | police | The Police | One Day International | International Nonproprietary Name | International Labour Organization |