I don't endorse putting authors into prison unless they are guilty of slander, libel or plagiarism.
I don't like questions targeted against a sunset of the population for which there is no evidence. There are no white people or black people. There are people who have a range of skin color from yellow, red, black, white, tan, brown, beige and that color depends on their recent activities related to the sun or tanning or use of chemicals or health conditions or makeup.
People who write history books usually have a long list of research materials that support their writing. Publishers who publish history books usually check the writer's credentials and facts.