> Am I buying something from a walmart shelve made from prison labor ?

Yep.

A quick google search with that very question finds lots of entries, many of course with an axe to grind. The Economist is rather dispassionate on the subject though: https://www.economist.com/news/united-states/21718897-idaho-...

But if you interact with the government, go to McDonalds, etc you're using prison labor. Whole Foods too (http://theweek.com/articles/630907/corporate-america-secret-...)

I said "yep" because I figured you were asking a general question; in the specific case Walmart's position is that they don't use prison labor (but plenty of web sites will tell you it's not true. Here's Huffpo: https://www.huffingtonpost.com/al-norman/walmart-prison-labo...).

This link is pretty good but requires a bit more epistemological digging: https://www.cagedbirdmagazine.com/single-post/2017/03/28/50-...

oh wow. I had no idea. Thank you for the information.

At WalMart, yes. Also JC Penny, Victoria's Secret, K-Mart, and Starbucks have all used prison labor. There's also prison call centers, such as those used by American Airlines and Avis.