These far-reaching measures are already drawing parallels to dark moments in scientific history. Some researchers say the recent mass firings, policy changes and grant cancellations at federal research institutions, including the U.S. National Institutes of Health and Centers for Disease Control and Prevention, closely mirror what happened in the U.S.S.R. under Stalin. “A similar threat now hangs over U.S. science,” the editorial board of The New England Journal of Medicine wrote in June.

Its editorial invoked the example of Trofim Lysenko, an agronomist and astute political operator who rose to power in the 1930s Soviet Union under Stalin.