Scientists throughout history, from Galileo to today’s experts on climate change, have often had to contend with politics in their pursuit of knowledge. But in the Soviet Union, where the ruling elites embraced, patronized, and even fetishized science like never before, scientists lived their lives on a knife edge. The Soviet Union had the best-funded scientific establishment in history. Scientists were elevated as popular heroes and lavished with awards and privileges. But if their ideas or their field of study lost favor, they could be exiled, imprisoned, or murdered. And yet they persisted, making major contributions to twentieth-century science.