Surrounded by the fresh food they pick to send to supermarkets, but living in flimsy shacks, workers in Spain tell Siobhan Kennedy how their dreams of better lives are crushed by the grim reality of exploitation.Sign up for Snowmail, your daily preview of what is on Channel 4 News, sent straight to your inbox, here: http://mailing.channel4.com/public/snowmail/remotebox.jsp
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