While a considerable secondary literature revolves around the issue of whether Marx believed that the concepts of “justice” and “injustice” – and hence, by implication, other comparable moral terms as well – had any non-relative meaning, there is really no doubt that a strong moral vision, with emphasis on the evil aspects of the capitalist system as a system of exploitation, undergirded all of his writings, particularly Capital.

https://link.springer.com/content/pdf/10.1186/s40853-016-0003-y.pdf

Fair i guess.