There may be others, but this brand has made it their focus: https://tonyschocolonely.com/us/en/our-mission
Nowadays their slogan is "Crazy about chocolate. Serious about people".
They seem to constantly weaken their slogan.
As I understand it they're less strictly idealistic than they used to be so as to be a profitable business, but at least it wasn't an attempt at fairwashing an existing brand.
[1] Actually Teun (van de Keuken), but that doesn't work well in English.
Ha, Neuken in de Keuken, is the only Dutch I know.