In September 2018 Ethical Consumer searched Ebooks.com and found that it only sold audiobooks. The company there was not rated for supply chain management.

Reference:

https://www.audiobooks.co.uk/ (11 September 2018)

In April 2020 Ethical Consumer viewed KKR's SEC Filing Form 10-K for the year ending 31 December 2019. It stated that the company had subsidiaries located in Saudi Arabia, Mexico and China. At the time of writing Ethical Consumer considered these jurisdictions to be governed by oppressive regimes.
As a result the company lost half a mark under Human Rights.

Reference:

SEC Filing Form 10-K (2019) (December 2019)