In general, the most effective protests against corporate corruption have a visual element. Imagery transcends language and requires mininal engagment in order to convey a message. We've talked quite a bit about the power of culture jamming and shopdropping to stir up consumer solidarity and catalyze change.
Unicef recently launched a visual campaign against child labor with images of apparel labels depicting children hunched over sewing machines or working in fields. The graphics themselves are subtle in that they appear - at first glance - to be ordinary logos; this makes them that much more striking when you realize what you're looking at. The URL provided on these campaign posters doesn't seem to work (controversy over the campaign?), but you can view more of the designs here and here (including the neckline of a T-shirt the threading of which spells out "SOS" in morse code).
THIS NEEDDS TO STOP ASAP!!!!!!!!!