A star academic behind an influential but unsound study arguing that black infants die more often with white doctors has for years been privately beleaguered by plagiarism charges from her own subordinates and will soon depart her university, leaving the multimillion-dollar antiracism center she founded in jeopardy. University of Minnesota Prof. Rachel Hardeman’s rise to academic superstardom in the wake of the death of George Floyd in Minneapolis included major media coverage of her research on racial bias and maternal and infant mortality, a tenured position, and recognition as one of Time Magazine’s 100 most influential people. Now, two former...