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Write to your favorite food company. Ask them about their sourcing and tell them it matters to you.
Do you have an Android or iPhone? Install the Slavery Footprint app to find out more about the supply chain attached to the products you already purchase. I don’t have the appropriate phone to use this, but it looks interesting. You can also take a survey to find out the approximate number of slaves that work for you and use the app to take steps to lessen that number.