The International Amateur Radio Union (IARU) is an organization that represents the amateur radio community. It consists of over 160 national amateur radio societies around the world. This video which is from the recent RSGB convention gives an idea of the work the IARU does and the challenges facing amateur radio in the future.
Roughly £1.30 / €1.50 of the membership fee of each national society goes towards the work of the IARU. Obviously the more members a national society has then the better.