slave labor and big retail

This Guardian video describes the involvement of megachain retailers, such as Walmart, in selling shrimp that was produced through slave labor. 
See the entire Guardian series on Modern-Day Slavery at 
http://www.theguardian.com/global-development/series/modern-day-slavery-in-focus
Also see the Guardian's YouTube playlist at
https://www.youtube.com/playlist?list=PLa_1MA_DEorF1PPQA6nRiRPqnnHaJFUoR