https://www.fairphone.com/wp-content/uploads/2020/05/016_005...
One of which is "O-Film"
Apple dropped them because they used forced labor: https://9to5mac.com/2020/12/03/iphone-camera-supplier-o-film...
So, it's probably reasonable to suspect that FairPhone does (or did) use suppliers that used forced labor. I only checked the one because I had remembered hearing it somewhere.