The Visual Effects Society issues an "Industry Bill of Rights". The VES Board unanimously voted to approve the document outlining the rights of visual effects workers, facilities and studios. You can read the entire document by clicking on the image below.
In the Summer of 2008 my family and I spent three months in Vancouver working for a visual effects company on a major studio release. When the film came out in theaters, I did not receive screen credit. I hope this bill of rights would eliminate that kind of thing from happening in the future. A credit winds up being the equivalent of a published work when it comes to academia. That studio/facility denying credit has the potential to put one's future job security at risk.