They're not exactly sweated labour, nor is it bonded servitude, but I can see why US screenwriters have folded and closed their laptops, said a fond farewell to the rigours of the desk and picked up the placards: "Will work for better residuals ! Fight for the right to write ! Fair day's pay" Makes sense to me.

This is something a writer friend popped over in an e-mail. See what the Writer's Guild have to say. No clearer way to state a case than doing it simply and visually.