Evolutionary biologist and Marxist, Richard Lewontin, was credited for conceptually undermining the notion of human races, for a time:
https://en.wikipedia.org/wiki/Human_Genetic_Diversity:_Lewontin%27s_Fallacy
https://en.wikipedia.org/wiki/Richard_Lewontin
The argument, employed by this Marxist, was that the majority of genetic diversity is found between populations, not races, so no justification could be made for continual use of racial categories. As such the argument was incoherent in the face of it, since, it assumed the existence of races to begin the analysis. It found that 85.4 percent of genetic variation is between populations, while 8.3 percent of the variance is between races. All that shows is that there is more genetic variance between individuals that between races, which if true is nothing much to write home about, since individuals are extremely diverse. The argument was criticised by A. Edwards:
https://onlinelibrary.wiley.com/doi/abs/10.1002/bies.10315
Arguing “This conclusion, due to R.C. Lewontin in 1972, is unwarranted because the argument ignores the fact that most of the information that distinguishes populations is hidden in the correlation structure of the data and not simply in the variation of the individual factors.” A simpler refutation, a reductio ad absurdum, would be to use the same cosmopolitan Marxist biology applied to chimps, which have 98 percent of the “same” DNA as humans, although some say the figure is about 95 percent:
https://creation.com/greater-than-98-chimp-human-dna-similarity-not-any-more
By Lewontin’s cosmopolitan Marxist logic, we should also eliminate the human/chimp division as well. In fact, the Lewontin approach is becoming a relic of the Leftoid sociological past:
https://www.nature.com/articles/nrg.2017.104
https://www.counter-currents.com/2018/06/racial-realities/