I've been an active member of our professional association here in Australia (Illustrators Australia) since the NSW illustrators were invited to join up and create a national association back in the late 1980's. The main goal was to create a culture of awareness for illustrators and their clients in regards to artists' rights.
I have been both President and Vice president of the NSW branch working for about five years with my colleague Lew Keilar on behalf of Australian illustrators. FYI: Current President is Christopher Nielsen and Vice President is Nigel Buchanan. Email them at email@example.com for info.
Have a look at my folio page there as well which will inevitably have images of a different bent to what is published here.